diff --git a/apps/api/src/memo-list-service.test.mjs b/apps/api/src/memo-list-service.test.mjs
index 40620c64..c9576e29 100644
--- a/apps/api/src/memo-list-service.test.mjs
+++ b/apps/api/src/memo-list-service.test.mjs
@@ -91,6 +91,51 @@ describe("memo list service", () => {
     }
   });
 
+  test("paginates title Z-A by reverse title and keeps the update-time tie break", async () => {
+    const titleExpression = "LOWER(COALESCE(NULLIF(m.title, ''), '无标题笔记'))";
+    const firstDatabase = createDatabase({
+      rows: [memoRow("memo_1", { title: "Zulu" }), memoRow("memo_2", { title: "Alpha" })],
+      totalCount: 2,
+    });
+    const first = await listMemos(firstDatabase, {
+      workspaceId: "ws_1",
+      sort: "title-desc",
+      limit: 1,
+    });
+    const orderQuery = firstDatabase.calls.find((call) => call.sql.includes("ORDER BY"));
+
+    expect(orderQuery.sql).toContain(`m.is_pinned DESC, ${titleExpression} DESC, m.updated_at DESC, m.id DESC`);
+    expect(orderQuery.sql).not.toContain(`${titleExpression} ASC`);
+
+    const secondDatabase = createDatabase({ rows: [] });
+    await listMemos(secondDatabase, {
+      workspaceId: "ws_1",
+      sort: "title-desc",
+      limit: 1,
+      cursor: first.nextCursor,
+    });
+    const pageQuery = secondDatabase.calls.find((call) => call.sql.includes("SELECT m.id"));
+
+    expect(pageQuery.sql).toContain(`${titleExpression} < ?`);
+    expect(pageQuery.sql).not.toContain(`${titleExpression} > ?`);
+    expect(pageQuery.sql).toContain("m.updated_at < ?");
+    expect(pageQuery.parameters).toContain("zulu");
+    expect(pageQuery.parameters).toContain("2026-08-01T01:00:00.000Z");
+  });
+
+  test("keeps trash ordered by deletion time when the title sort is reversed", async () => {
+    const database = createDatabase();
+    await listMemos(database, {
+      workspaceId: "ws_1",
+      includeTrash: true,
+      sort: "title-desc",
+    });
+    const pageQuery = database.calls.find((call) => call.sql.includes("ORDER BY"));
+
+    expect(pageQuery.sql).toContain("ORDER BY m.deleted_at DESC, m.id DESC");
+    expect(pageQuery.sql).not.toContain("NULLIF(m.title, '')");
+  });
+
   test("filters by one exact tag in page and count queries", async () => {
     const database = createDatabase();
     await listMemos(database, {
diff --git a/apps/api/src/memo-list-service.ts b/apps/api/src/memo-list-service.ts
index b274f3d3..929339b4 100644
--- a/apps/api/src/memo-list-service.ts
+++ b/apps/api/src/memo-list-service.ts
@@ -30,7 +30,7 @@ export type MemoSummaryRow = {
   revision: number;
 };
 
-type MemoListSortMode = "updated-desc" | "created-desc" | "title-asc";
+type MemoListSortMode = "updated-desc" | "created-desc" | "title-asc" | "title-desc";
 type MemoListFilterMode = "all" | "tagged" | "untagged" | "pinned";
 
 type MemoListCursor = {
@@ -94,7 +94,10 @@ const normalizeMemoTitle = (value: string | null | undefined) => {
 };
 
 const normalizeMemoListSort = (value: string | undefined): MemoListSortMode =>
-  value === "created-desc" || value === "title-asc" ? value : "updated-desc";
+  value === "created-desc" || value === "title-asc" || value === "title-desc" ? value : "updated-desc";
+
+const isTitleSort = (sort: MemoListSortMode): sort is "title-asc" | "title-desc" =>
+  sort === "title-asc" || sort === "title-desc";
 
 const normalizeMemoListFilter = (value: string | undefined): MemoListFilterMode =>
   value === "tagged" || value === "untagged" || value === "pinned" ? value : "all";
@@ -110,7 +113,7 @@ const encodeMemoListCursor = (
   else cursor.pinned = memo.is_pinned;
 
   if (sort === "created-desc") cursor.createdAt = memo.created_at;
-  else if (sort === "title-asc") {
+  else if (isTitleSort(sort)) {
     cursor.title = normalizeMemoTitle(memo.title).toLocaleLowerCase();
     cursor.updatedAt = memo.updated_at;
   } else cursor.updatedAt = memo.updated_at;
@@ -208,8 +211,9 @@ export const listMemos = async (
   const getOrderBy = () => {
     if (includeTrash) return "m.deleted_at DESC, m.id DESC";
     if (sort === "created-desc") return "m.is_pinned DESC, m.created_at DESC, m.id DESC";
-    if (sort === "title-asc") {
-      return `m.is_pinned DESC, ${titleSortExpression} ASC, m.updated_at DESC, m.id DESC`;
+    if (isTitleSort(sort)) {
+      const direction = sort === "title-desc" ? "DESC" : "ASC";
+      return `m.is_pinned DESC, ${titleSortExpression} ${direction}, m.updated_at DESC, m.id DESC`;
     }
     return "m.is_pinned DESC, m.updated_at DESC, m.id DESC";
   };
@@ -223,9 +227,10 @@ export const listMemos = async (
     } else if (sort === "created-desc") {
       cursorConditions.push("(m.is_pinned < ? OR (m.is_pinned = ? AND (m.created_at < ? OR (m.created_at = ? AND m.id < ?))))");
       cursorBinds.push(cursor.pinned ?? 0, cursor.pinned ?? 0, cursor.createdAt ?? "", cursor.createdAt ?? "", cursor.id);
-    } else if (sort === "title-asc") {
+    } else if (isTitleSort(sort)) {
+      const titleOperator = sort === "title-desc" ? "<" : ">";
       cursorConditions.push(
-        `(m.is_pinned < ? OR (m.is_pinned = ? AND (${titleSortExpression} > ? OR (${titleSortExpression} = ? AND (m.updated_at < ? OR (m.updated_at = ? AND m.id < ?))))))`,
+        `(m.is_pinned < ? OR (m.is_pinned = ? AND (${titleSortExpression} ${titleOperator} ? OR (${titleSortExpression} = ? AND (m.updated_at < ? OR (m.updated_at = ? AND m.id < ?))))))`,
       );
       cursorBinds.push(cursor.pinned ?? 0, cursor.pinned ?? 0, cursor.title ?? "", cursor.title ?? "", cursor.updatedAt ?? "", cursor.updatedAt ?? "", cursor.id);
     } else {
diff --git a/apps/ios/EdgeEver/Data/Database/LocalMirrorRepository.swift b/apps/ios/EdgeEver/Data/Database/LocalMirrorRepository.swift
index dfdf61ed..a671241e 100644
--- a/apps/ios/EdgeEver/Data/Database/LocalMirrorRepository.swift
+++ b/apps/ios/EdgeEver/Data/Database/LocalMirrorRepository.swift
@@ -133,6 +133,7 @@ final class LocalMirrorRepository: @unchecked Sendable {
                 switch params.sort {
                 case .createdDesc: orderBy = "is_pinned DESC, created_at DESC, id DESC"
                 case .titleAsc: orderBy = "is_pinned DESC, title COLLATE NOCASE ASC, updated_at DESC, id DESC"
+                case .titleDesc: orderBy = "is_pinned DESC, title COLLATE NOCASE DESC, updated_at DESC, id DESC"
                 case .updatedDesc: orderBy = "is_pinned DESC, updated_at DESC, id DESC"
                 }
             }
diff --git a/apps/ios/EdgeEver/Data/Models/Models.swift b/apps/ios/EdgeEver/Data/Models/Models.swift
index f8d55022..fb09b2e6 100644
--- a/apps/ios/EdgeEver/Data/Models/Models.swift
+++ b/apps/ios/EdgeEver/Data/Models/Models.swift
@@ -422,6 +422,7 @@ enum MemoSortMode: String, CaseIterable, Sendable {
     case updatedDesc = "updated-desc"
     case createdDesc = "created-desc"
     case titleAsc = "title-asc"
+    case titleDesc = "title-desc"
 }
 
 enum MemoFilterMode: String, CaseIterable, Sendable {
diff --git a/apps/ios/EdgeEver/Features/Workspace/ListActionsSheet.swift b/apps/ios/EdgeEver/Features/Workspace/ListActionsSheet.swift
index a7421e77..aa3a60a4 100644
--- a/apps/ios/EdgeEver/Features/Workspace/ListActionsSheet.swift
+++ b/apps/ios/EdgeEver/Features/Workspace/ListActionsSheet.swift
@@ -120,6 +120,15 @@ struct ListActionsSheet: View {
                         store.reload(env: env)
                         dismiss()
                     }
+                    optionRow(
+                        active: store.sort == .titleDesc,
+                        icon: nil,
+                        label: env.preferences.t("标题 Z-A", en: "Title Z-A", ja: "タイトル Z-A", pl: "Tytuł Z–A")
+                    ) {
+                        store.sort = .titleDesc
+                        store.reload(env: env)
+                        dismiss()
+                    }
 
                     divider
                     sheetItem(
diff --git a/apps/ios/Tests/EdgeEverTests/MobileUIParityTests.swift b/apps/ios/Tests/EdgeEverTests/MobileUIParityTests.swift
index 004aa954..40569e4a 100644
--- a/apps/ios/Tests/EdgeEverTests/MobileUIParityTests.swift
+++ b/apps/ios/Tests/EdgeEverTests/MobileUIParityTests.swift
@@ -158,6 +158,7 @@ final class MobileUIParityTests: XCTestCase {
         XCTAssertEqual(MemoListTimestampField.resolve(for: .createdDesc).value(from: memo), memo.createdAt)
         XCTAssertEqual(MemoListTimestampField.resolve(for: .updatedDesc).value(from: memo), memo.updatedAt)
         XCTAssertEqual(MemoListTimestampField.resolve(for: .titleAsc).value(from: memo), memo.updatedAt)
+        XCTAssertEqual(MemoListTimestampField.resolve(for: .titleDesc).value(from: memo), memo.updatedAt)
     }
 
     func testMemoDetailDateIncludesHistoricalYear() {
diff --git a/apps/mobile/src/lib/local-mirror.ts b/apps/mobile/src/lib/local-mirror.ts
index 3a662a6a..01f65914 100644
--- a/apps/mobile/src/lib/local-mirror.ts
+++ b/apps/mobile/src/lib/local-mirror.ts
@@ -136,7 +136,9 @@ export const listLocalMemos = async (scope: string, params: LocalMemoListParams)
       ? "is_pinned DESC, created_at DESC, id DESC"
       : params.sort === "title-asc"
         ? "is_pinned DESC, title COLLATE NOCASE ASC, updated_at DESC, id DESC"
-        : "is_pinned DESC, updated_at DESC, id DESC";
+        : params.sort === "title-desc"
+          ? "is_pinned DESC, title COLLATE NOCASE DESC, updated_at DESC, id DESC"
+          : "is_pinned DESC, updated_at DESC, id DESC";
   const tag = params.tag?.trim() ?? "";
   const limit = params.limit ?? 50;
   const offset = Math.max(0, params.offset ?? 0);
diff --git a/apps/mobile/src/screens/WorkspaceActionSheets.tsx b/apps/mobile/src/screens/WorkspaceActionSheets.tsx
index a126e2f8..05f23ac4 100644
--- a/apps/mobile/src/screens/WorkspaceActionSheets.tsx
+++ b/apps/mobile/src/screens/WorkspaceActionSheets.tsx
@@ -148,6 +148,7 @@ export const NotesActionsModal = ({
           <SheetOptionRow active={memoSortMode === "updated-desc"} label="最近更新" onPress={() => onSortModeChange("updated-desc")} />
           <SheetOptionRow active={memoSortMode === "created-desc"} label="创建时间" onPress={() => onSortModeChange("created-desc")} />
           <SheetOptionRow active={memoSortMode === "title-asc"} label="标题 A-Z" onPress={() => onSortModeChange("title-asc")} />
+          <SheetOptionRow active={memoSortMode === "title-desc"} label="标题 Z-A" onPress={() => onSortModeChange("title-desc")} />
         </ScrollView>
       </Pressable>
     </Pressable>
diff --git a/apps/mobile/src/screens/workspace-utils.test.ts b/apps/mobile/src/screens/workspace-utils.test.ts
index 67288e8d..5940ffc3 100644
--- a/apps/mobile/src/screens/workspace-utils.test.ts
+++ b/apps/mobile/src/screens/workspace-utils.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, test } from "bun:test";
-import type { Notebook } from "@edgeever/shared";
+import type { MemoSummary, Notebook } from "@edgeever/shared";
 import {
   filterCollapsedNotebookOptions,
   formatMemoDetailDate,
@@ -11,6 +11,7 @@ import {
   isEnglishMobileLocale,
   markdownToLocalText,
   parseTags,
+  sortMemoSummaries,
 } from "./workspace-utils";
 
 const notebook = (id: string, parentId: string | null, sortOrder: number): Notebook => ({
@@ -91,4 +92,25 @@ describe("mobile workspace utilities", () => {
       Intl.DateTimeFormat.prototype.resolvedOptions = original;
     }
   });
+
+  test("reverses title order and keeps equal titles in their original order", () => {
+    const memo = (id: string, title: string): MemoSummary => ({
+      id,
+      notebookId: "nb",
+      title,
+      excerpt: "",
+      tags: [],
+      isPinned: false,
+      isArchived: false,
+      isDeleted: false,
+      revision: 1,
+      createdAt: "2026-08-01T00:00:00.000Z",
+      updatedAt: "2026-08-01T00:00:00.000Z",
+      deletedAt: null,
+    });
+    const memos = [memo("b", "Alpha"), memo("a", "Alpha"), memo("z", "Zulu")];
+
+    expect(sortMemoSummaries(memos, "title-asc").map((item) => item.id)).toEqual(["b", "a", "z"]);
+    expect(sortMemoSummaries(memos, "title-desc").map((item) => item.id)).toEqual(["z", "b", "a"]);
+  });
 });
diff --git a/apps/mobile/src/screens/workspace-utils.ts b/apps/mobile/src/screens/workspace-utils.ts
index 303f6d05..59f33e60 100644
--- a/apps/mobile/src/screens/workspace-utils.ts
+++ b/apps/mobile/src/screens/workspace-utils.ts
@@ -166,8 +166,9 @@ export const formatMemoDetailDate = (value: string, locale: string) => {
 
 export const sortMemoSummaries = (memos: MemoSummary[], sortMode: unknown) =>
   [...memos].sort((left, right) => {
-    if (sortMode === "title-asc") {
-      return (left.title || DEFAULT_MEMO_TITLE).localeCompare(right.title || DEFAULT_MEMO_TITLE);
+    if (sortMode === "title-asc" || sortMode === "title-desc") {
+      const titleCompare = (left.title || DEFAULT_MEMO_TITLE).localeCompare(right.title || DEFAULT_MEMO_TITLE);
+      return sortMode === "title-desc" ? -titleCompare : titleCompare;
     }
     if (sortMode === "created-desc") {
       return right.createdAt.localeCompare(left.createdAt);
diff --git a/apps/web/src/lib/app-helpers.ts b/apps/web/src/lib/app-helpers.ts
index 04bdf32b..445c79cb 100644
--- a/apps/web/src/lib/app-helpers.ts
+++ b/apps/web/src/lib/app-helpers.ts
@@ -169,6 +169,7 @@ export const getMemoSortOptions = (t: TFunction): Array<{ value: MemoSortMode; l
   { value: "updated-desc", label: t("options.memoSort.updatedDesc") },
   { value: "created-desc", label: t("options.memoSort.createdDesc") },
   { value: "title-asc", label: t("options.memoSort.titleAsc") },
+  { value: "title-desc", label: t("options.memoSort.titleDesc") },
 ];
 
 const NOTEBOOK_SORT_VALUES: NotebookSortMode[] = ["custom", "name-asc", "memo-count-desc", "updated-desc"];
@@ -707,14 +708,14 @@ export const sortMemos = (memos: MemoSummary[], sortMode: MemoSortMode, prioriti
       return first.isPinned ? -1 : 1;
     }
 
-    if (sortMode === "title-asc") {
+    if (sortMode === "title-asc" || sortMode === "title-desc") {
       const titleCompare = getMemoTitle(first.title).localeCompare(getMemoTitle(second.title), "zh-CN", {
         numeric: true,
         sensitivity: "base",
       });
 
       if (titleCompare !== 0) {
-        return titleCompare;
+        return sortMode === "title-desc" ? -titleCompare : titleCompare;
       }
 
       return compareDateDesc(first.updatedAt, second.updatedAt);
diff --git a/apps/web/src/lib/local-mirror.ts b/apps/web/src/lib/local-mirror.ts
index 20261fa7..32652b43 100644
--- a/apps/web/src/lib/local-mirror.ts
+++ b/apps/web/src/lib/local-mirror.ts
@@ -264,7 +264,11 @@ export const listLocalMemos = async (scope: string, params: LocalMemoListParams)
   memos.sort((left, right) => {
     if (params.trash) return (right.deletedAt ?? "").localeCompare(left.deletedAt ?? "") || right.id.localeCompare(left.id);
     if (params.sort === "created-desc") return right.createdAt.localeCompare(left.createdAt) || right.id.localeCompare(left.id);
-    if (params.sort === "title-asc") return (left.title || left.excerpt).localeCompare(right.title || right.excerpt, "zh-CN") || right.updatedAt.localeCompare(left.updatedAt);
+    if (params.sort === "title-asc" || params.sort === "title-desc") {
+      const titleCompare = (left.title || left.excerpt).localeCompare(right.title || right.excerpt, "zh-CN");
+      if (titleCompare !== 0) return params.sort === "title-desc" ? -titleCompare : titleCompare;
+      return right.updatedAt.localeCompare(left.updatedAt);
+    }
     return Number(right.isPinned) - Number(left.isPinned) || right.updatedAt.localeCompare(left.updatedAt) || right.id.localeCompare(left.id);
   });
 
diff --git a/apps/web/src/lib/memo-list-cache.ts b/apps/web/src/lib/memo-list-cache.ts
index e80befdf..820b82bf 100644
--- a/apps/web/src/lib/memo-list-cache.ts
+++ b/apps/web/src/lib/memo-list-cache.ts
@@ -59,11 +59,14 @@ const sortMemoSummariesForList = (memos: MemoSummary[], queryKey: readonly unkno
   const sortMode = queryKey[5];
   const sorted = [...memos];
 
-  if (sortMode === "title-asc") {
+  if (sortMode === "title-asc" || sortMode === "title-desc") {
+    const direction = sortMode === "title-desc" ? -1 : 1;
     return sorted.sort((left, right) => {
       const leftTitle = left.title?.trim() || left.excerpt || DEFAULT_MEMO_TITLE;
       const rightTitle = right.title?.trim() || right.excerpt || DEFAULT_MEMO_TITLE;
-      return leftTitle.localeCompare(rightTitle, "zh-CN") || left.id.localeCompare(right.id);
+      const titleCompare = leftTitle.localeCompare(rightTitle, "zh-CN");
+      if (titleCompare !== 0) return titleCompare * direction;
+      return left.id.localeCompare(right.id);
     });
   }
 
diff --git a/crates/desktop-sidecar/src/memo.rs b/crates/desktop-sidecar/src/memo.rs
index d76c5972..1234bb62 100644
--- a/crates/desktop-sidecar/src/memo.rs
+++ b/crates/desktop-sidecar/src/memo.rs
@@ -436,6 +436,9 @@ pub(crate) fn list_memos(database: &Connection, params: &Value) -> Result<Value,
         Some("title-asc") => {
             "COALESCE(m.title, m.excerpt) COLLATE NOCASE ASC, m.updated_at DESC, m.id DESC"
         }
+        Some("title-desc") => {
+            "COALESCE(m.title, m.excerpt) COLLATE NOCASE DESC, m.updated_at DESC, m.id DESC"
+        }
         _ if trash => "m.deleted_at DESC, m.id DESC",
         _ => "m.is_pinned DESC, m.updated_at DESC, m.id DESC",
     };
diff --git a/docs/plugin-development.md b/docs/plugin-development.md
index 0ade8c7a..b4ae88ca 100644
--- a/docs/plugin-development.md
+++ b/docs/plugin-development.md
@@ -176,7 +176,7 @@ const result = await context.notes.query({
   notebookId: "optional-notebook-id",
   text: "keyword",
   tags: ["todo"],
-  sort: "updated-desc", // "updated-desc" | "created-desc" | "title-asc"
+  sort: "updated-desc", // "updated-desc" | "created-desc" | "title-asc" | "title-desc"
   limit: 50,
   offset: 0
 });
diff --git a/docs/plugin-development.zh-CN.md b/docs/plugin-development.zh-CN.md
index 8397bbe5..fffe341a 100644
--- a/docs/plugin-development.zh-CN.md
+++ b/docs/plugin-development.zh-CN.md
@@ -176,7 +176,7 @@ const result = await context.notes.query({
   notebookId: "optional-notebook-id",
   text: "关键词",
   tags: ["todo"],
-  sort: "updated-desc", // "updated-desc" | "created-desc" | "title-asc"
+  sort: "updated-desc", // "updated-desc" | "created-desc" | "title-asc" | "title-desc"
   limit: 50,
   offset: 0
 });
diff --git a/packages/client/src/index.ts b/packages/client/src/index.ts
index e2694572..a9174de7 100644
--- a/packages/client/src/index.ts
+++ b/packages/client/src/index.ts
@@ -131,7 +131,7 @@ export type InstanceRelease = {
 };
 
 export type MemoFilterMode = "all" | "tagged" | "untagged" | "pinned";
-export type MemoSortMode = "updated-desc" | "created-desc" | "title-asc";
+export type MemoSortMode = "updated-desc" | "created-desc" | "title-asc" | "title-desc";
 
 export type ListNotebooksResponse = {
   notebooks: Notebook[];
diff --git a/packages/plugin-api/dist/index.d.ts b/packages/plugin-api/dist/index.d.ts
index 9789831a..163aee19 100644
--- a/packages/plugin-api/dist/index.d.ts
+++ b/packages/plugin-api/dist/index.d.ts
@@ -199,7 +199,7 @@ export interface PluginNoteQuery {
     notebookId?: string;
     text?: string;
     tags?: string[];
-    sort?: "updated-desc" | "created-desc" | "title-asc";
+    sort?: "updated-desc" | "created-desc" | "title-asc" | "title-desc";
     limit?: number;
     offset?: number;
 }
diff --git a/packages/plugin-api/src/index.ts b/packages/plugin-api/src/index.ts
index 800209b6..4bcb1a5e 100644
--- a/packages/plugin-api/src/index.ts
+++ b/packages/plugin-api/src/index.ts
@@ -239,7 +239,7 @@ export interface PluginNoteQuery {
   notebookId?: string;
   text?: string;
   tags?: string[];
-  sort?: "updated-desc" | "created-desc" | "title-asc";
+  sort?: "updated-desc" | "created-desc" | "title-asc" | "title-desc";
   limit?: number;
   offset?: number;
 }
diff --git a/packages/shared/src/desktop-rpc.ts b/packages/shared/src/desktop-rpc.ts
index 02bc2c43..a62f444e 100644
--- a/packages/shared/src/desktop-rpc.ts
+++ b/packages/shared/src/desktop-rpc.ts
@@ -66,7 +66,7 @@ export type DesktopMemoListParams = {
   q?: string;
   tag?: string;
   trash?: boolean;
-  sort?: "updated-desc" | "created-desc" | "title-asc";
+  sort?: "updated-desc" | "created-desc" | "title-asc" | "title-desc";
   filter?: "all" | "pinned" | "tagged" | "untagged";
   limit?: number;
   offset?: number;
diff --git a/packages/shared/src/i18n/en-US.ts b/packages/shared/src/i18n/en-US.ts
index 64dd7de4..aeacb756 100644
--- a/packages/shared/src/i18n/en-US.ts
+++ b/packages/shared/src/i18n/en-US.ts
@@ -2083,6 +2083,7 @@ export const enUS = {
       updatedDesc: "Recently updated",
       createdDesc: "Created time",
       titleAsc: "Title A-Z",
+      titleDesc: "Title Z-A",
     },
     notebookSort: {
       custom: "Custom",
diff --git a/packages/shared/src/i18n/ja.ts b/packages/shared/src/i18n/ja.ts
index 9893da29..3006bbd1 100644
--- a/packages/shared/src/i18n/ja.ts
+++ b/packages/shared/src/i18n/ja.ts
@@ -2072,6 +2072,7 @@ export const ja = {
       updatedDesc: "最近の更新",
       createdDesc: "作成日時",
       titleAsc: "タイトル A-Z",
+      titleDesc: "タイトル Z-A",
     },
     notebookSort: {
       custom: "カスタム",
diff --git a/packages/shared/src/i18n/pl.ts b/packages/shared/src/i18n/pl.ts
index af00e00f..fa49f909 100644
--- a/packages/shared/src/i18n/pl.ts
+++ b/packages/shared/src/i18n/pl.ts
@@ -2072,6 +2072,7 @@ export const pl = {
       updatedDesc: "Ostatnio zaktualizowane",
       createdDesc: "Data utworzenia",
       titleAsc: "Tytuł A–Z",
+      titleDesc: "Tytuł Z–A",
     },
     notebookSort: {
       custom: "Własna",
diff --git a/packages/shared/src/i18n/zh-CN.ts b/packages/shared/src/i18n/zh-CN.ts
index 51bd947d..9058b965 100644
--- a/packages/shared/src/i18n/zh-CN.ts
+++ b/packages/shared/src/i18n/zh-CN.ts
@@ -2083,6 +2083,7 @@ export const zhCN = {
       updatedDesc: "最近更新",
       createdDesc: "创建时间",
       titleAsc: "标题 A-Z",
+      titleDesc: "标题 Z-A",
     },
     notebookSort: {
       custom: "自定义",
diff --git a/packages/shared/src/memo-timestamps.test.mjs b/packages/shared/src/memo-timestamps.test.mjs
index 6eb75bb4..3dc0ede9 100644
--- a/packages/shared/src/memo-timestamps.test.mjs
+++ b/packages/shared/src/memo-timestamps.test.mjs
@@ -24,5 +24,9 @@ describe("memo list timestamps", () => {
       field: "updatedAt",
       value: timestamps.updatedAt,
     });
+    expect(getMemoListTimestamp(timestamps, "title-desc")).toEqual({
+      field: "updatedAt",
+      value: timestamps.updatedAt,
+    });
   });
 });
diff --git a/tests/web-memo-list-cache.test.ts b/tests/web-memo-list-cache.test.ts
index 174040ed..2b27c6a6 100644
--- a/tests/web-memo-list-cache.test.ts
+++ b/tests/web-memo-list-cache.test.ts
@@ -78,6 +78,21 @@ describe("memo list cache updates", () => {
     expect(cached?.pages[0]?.totalCount).toBe(1);
   });
 
+  test("reorders a cached list from Z to A without reversing the id tie break", () => {
+    const queryClient = new QueryClient();
+    const queryKey = ["memos", "notebook", null, "", "all", "title-desc"] as const;
+    queryClient.setQueryData(queryKey, queryData([[
+      memo({ id: "memo-b", title: "Alpha" }),
+      memo({ id: "memo-a", title: "Alpha" }),
+      memo({ id: "memo-z", title: "Zulu" }),
+    ]]));
+
+    updateMemoSummaryInLists(queryClient, memo({ id: "memo-z", title: "Zulu", revision: 2 }));
+
+    const titles = queryClient.getQueryData<MemoListQueryData>(queryKey)?.pages[0]?.memos.map((item) => item.id);
+    expect(titles).toEqual(["memo-z", "memo-a", "memo-b"]);
+  });
+
   test("removes a note when an edit no longer matches the selected exact tag", () => {
     const queryClient = new QueryClient();
     const queryKey = ["memos", "notebook", null, "", "all", "updated-desc", [], "demo"] as const;