diff --git a/.github/workflows/check-urls.yml b/.github/workflows/check-urls.yml
index b123ce05b9d9..127aecc5b0d3 100644
--- a/.github/workflows/check-urls.yml
+++ b/.github/workflows/check-urls.yml
@@ -6,8 +6,9 @@
 name: Check URLs
 
 on:
-  schedule:
-    - cron: '0 4 * * 2' # Tues 4:00 AM UTC
+  pull_request:
+    branches:
+    - bugfix-2.1.x
 
 jobs:
   check_urls:
@@ -35,6 +36,7 @@ jobs:
       run: |
         UA="Mozilla/5.0 (Linux; Android 10; SM-G996U Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36"
         UTMP=$(mktemp)
+        echo "[debug 1] UTMP = ${UTMP}"
         echo "Gathering URLs. Please wait..."
         grep -R -E "https?:\/\/[^ \"''\(\)\<\>]+" . 2>/dev/null \
           | grep -v "Binary file" \
@@ -48,6 +50,7 @@ jobs:
           | sort -u -R \
           >"$UTMP"
 
+          echo "[debug 2] link count = $(wc -l $UTMP)"
           ISERR=
           declare -a BADURLS
           set +e
@@ -82,6 +85,7 @@ jobs:
             fi
           done <"$UTMP"
 
+          echo "[debug 3]"
           if [[ -n $ISERR ]]; then
             # Join bad URLs into a bulleted markdown list
             printf -v BADSTR -- "- %s\n" "${BADURLS[@]}"
@@ -89,6 +93,8 @@ jobs:
             echo -e "\n$BODY"
             gh issue comment 26975 --repo $GITHUB_REPOSITORY --body "${BODY}"
             exit 1
+          else
+            gh issue comment 26975 --body "Comment generated by action."
           fi
 
           echo -e "\nURL Check Passed."