diff --git a/.github/workflows/check_code_format.yml b/.github/workflows/check_code_format.yml
index fce3fd6..bab6547 100644
--- a/.github/workflows/check_code_format.yml
+++ b/.github/workflows/check_code_format.yml
@@ -33,4 +33,8 @@ jobs:
              git status --porcelain=v1
              exit 1
           fi
+
+      - name: Show exact diff of needed reformatting
+        if: failure()
+        run: fprettify --indent 4 --recursive --diff .
 ...