diff --git a/.github/workflows/pr_title.yaml b/.github/workflows/pr_title.yaml
index 4e80e513d..39dcdb34a 100644
--- a/.github/workflows/pr_title.yaml
+++ b/.github/workflows/pr_title.yaml
@@ -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:
   pull_request_target:
     types: [opened, edited, synchronize, reopened]