diff --git a/%5BTA%5D-JOJ-preparation-and-testing.md b/%5BTA%5D-JOJ-preparation-and-testing.md
index aad22a9..41af6bf 100644
--- a/%5BTA%5D-JOJ-preparation-and-testing.md
+++ b/%5BTA%5D-JOJ-preparation-and-testing.md
@@ -131,6 +131,7 @@ The first time JOJ is setup:
 
 Only release when ready:
   - test the setup using a separate JOJ `conf-root` called `tt` and ensure to never make it accessible to students
+  - check the action output and ensure to `WARNING` is displayed (the action will fail in case of `ERROR` in the configuration file)
   - if an assignment has several tasks, ensure all of them work well before releasing to students
   - release a whole assignment at once, don't release task by task