diff --git a/gitlab-runner_config_example/shell/etc/gitlab-runner/config.toml b/gitlab-runner_config_example/shell/etc/gitlab-runner/config.toml
index 7527edd..5cac6f6 100644
--- a/gitlab-runner_config_example/shell/etc/gitlab-runner/config.toml
+++ b/gitlab-runner_config_example/shell/etc/gitlab-runner/config.toml
@@ -6,7 +6,7 @@
 # this means you need to manage python3 repos @ localhost by yourself!
 # but this builds really fast, because no image fetch/ no update packages, just make !
 
-concurrent = 2
+concurrent = 2 # this should be > 0
 check_interval = 0
 
 [session_server]