diff --git a/.github/workflows/pr_title.yml b/.github/workflows/pr_title.yml
index c796dbe..5f4e6db 100644
--- a/.github/workflows/pr_title.yml
+++ b/.github/workflows/pr_title.yml
@@ -1,5 +1,9 @@
 name: PR Title Check
 
+# GitHub blocks pull_request_target in public repositories by default. A
+# repository Actions policy (Settings > Actions > Policies) allows it for this
+# workflow only, matched by its file path, so renaming or moving this file
+# blocks the check until the policy's workflow path is updated to match.
 on:
   # synchronize is required even though a push changes neither the title nor the
   # description: "PR title / description conforms to semantic-release" is a