diff --git a/.github/workflows/validate-renovate.yml b/.github/workflows/validate-renovate.yml
index 10fe470a..ee43628f 100644
--- a/.github/workflows/validate-renovate.yml
+++ b/.github/workflows/validate-renovate.yml
@@ -50,11 +50,12 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           DIFF_TEXT: ${{ steps.lint.outputs.DIFF }}
           URL: ${{ github.event.pull_request.html_url }}
-        run:
+        run: |
           COMMENT_BUFFER="$(mktemp)"
           
-          # shellcheck disable=
           printf "I'm sorry, but this config should be migrated. Please apply following patch file to proceed:" >> "$COMMENT_BUFFER"
+          printf '```' >> "$COMMENT_BUFFER"
           cat "$DIFF_TO_BE_REPORTED" >> "$COMMENT_BUFFER"
+          printf '```' >> "$COMMENT_BUFFER"
           
           gh pr comment -F "$COMMENT_BUFFER" "${URL}"