diff --git a/doc/installation.md b/doc/installation.md
index 2d273836bf5..0a9858e9d1b 100644
--- a/doc/installation.md
+++ b/doc/installation.md
@@ -342,7 +342,7 @@ Create init script in /etc/init.d/gitlab:
 
 GitLab autostart:
 
-    sudo update-rc.d gitlab defaults
+    sudo update-rc.d gitlab defaults 21
 
 Now you can start/restart/stop GitLab like: