diff --git a/app/__init__.py b/app/__init__.py
new file mode 100644
index 0000000..bb4ffcb
--- /dev/null
+++ b/app/__init__.py
@@ -0,0 +1 @@
+"""App package marker."""
diff --git a/app/api/__init__.py b/app/api/__init__.py
new file mode 100644
index 0000000..a149018
--- /dev/null
+++ b/app/api/__init__.py
@@ -0,0 +1 @@
+"""API package marker."""
diff --git a/app/api/v1/__init__.py b/app/api/v1/__init__.py
new file mode 100644
index 0000000..13f4814
--- /dev/null
+++ b/app/api/v1/__init__.py
@@ -0,0 +1 @@
+"""API v1 package marker."""