service/ci.md

@@ -267,7 +267,11 @@ Alternatively, this will also clean old containers:
     /usr/local/sbin/tpo-docker-clean-cache
 
 The `tpa-du-gl-volumes` script can also be used to analyse which
-project is using the most disk space. Then those pipelines can be
+project is using the most disk space:
+
+    tpa-du-gl-volumes ~gitlab-runner/.local/share/containers/storage/volumes/*
+
+Then those pipelines can be
 adjusted to cache less.
 
 ### Disk full on GitLab server