diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f7fa4120f05c24bc62ba67f5f4485f1bbe55159c..24e2acdde29040f16fc3c3a55c9f70ecde9a674c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,3 +1,5 @@
+# IMPORTANT: running the pipeline for testing, keep in mind, re-building an existing package version fails! For testing, build for an old tag which does not have a package in the registry, yet. Delete the package after testing.
+
 build-package:
   stage: deploy
   image: python:3.6