diff --git a/03-core-features/filters/included-file.md b/03-core-features/filters/included-file.md
index e69de29b..def39a67 100644
--- a/03-core-features/filters/included-file.md
+++ b/03-core-features/filters/included-file.md
@@ -0,0 +1,21 @@
+# Path Filter Demo: Included File
+
+## Purpose
+This `.md` file demonstrates GitHub Actions **path filters**.
+
+## How it works
+The workflow [03-core-features--04-triggers-and-filters.yaml](../.github/workflows/03-core-features--04-triggers-and-filters.yaml) triggers on `pull_request` events when:
+
+```
+paths:
+  - '03-core-features/filters/*.md'     # ✅ Includes this file
+  - '!03-core-features/filters/*.txt'   # ❌ Excludes excluded-file.txt
+```
+
+**Commit changes to this file** → Workflow triggers on PR.
+
+**See also:** [Core Features Overview](../README.md)
+
+---
+*Example file for GitHub Actions learning repo.*
+