diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5d2bb0cf1f47824c3e246712788f3187b2fd0617..8ca25820ca8a8d562a71858eca13ad287c2f746e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,4 +4,4 @@ build_image:
     - docker push gitlab-registry.cern.ch/chweber/zx_postprocessingplotter:zx_limit_container_test
 
   tags:
-    - docker-image-build
+    - docker-image-build # we need a ci runner that has the special docker image building ability