diff --git a/debian/conf/gitlab-debian.conf.example b/debian/conf/gitlab-debian.conf.example
index 7427978614..1ef2d433b4 100644
--- a/debian/conf/gitlab-debian.conf.example
+++ b/debian/conf/gitlab-debian.conf.example
@@ -1,3 +1,5 @@
+# Variables with all small letters are debian specific
+# Variables with all caps are passed to gitlab app
 RAILS_ENV=production
 DB=postgres
 gitlab_app_root=/usr/share/gitlab