diff --git a/doc/install/docker.md b/doc/install/docker.md
index ac15b5490ce15455f9494e8dbc3148997d5a3abb..0ba41e06b65237b6c80919a32708fe929a4d0b5d 100644
--- a/doc/install/docker.md
+++ b/doc/install/docker.md
@@ -35,7 +35,10 @@ to community resources (such as IRC or forums) to seek help from other users.
 
 ## Prerequisites
 
-Docker is required. See the [official installation documentation](https://docs.docker.com/get-docker/).
+To use the GitLab Docker images:
+
+- You must install Docker.
+- You must use a valid externally-accessible hostname. Do not use `localhost`.
 
 ## Set up the volumes location