diff --git a/doc/administration/container_registry.md b/doc/administration/container_registry.md
index d5d433034546fe77676447cc0ceee6af1ef10605..44ed8c88a39b49c4c1d9e47d3a807d87ac652672 100644
--- a/doc/administration/container_registry.md
+++ b/doc/administration/container_registry.md
@@ -122,6 +122,10 @@ Registry is exposed to the outside world is `4567`, here is what you need to set
 in `gitlab.rb` or `gitlab.yml` if you are using Omnibus GitLab or installed
 GitLab from source respectively.
 
+>**Note:**
+Be careful to choose a port different than the one that Registry listens to (`5000` by default),
+otherwise you will run into conflicts .
+
 ---
 
 **Omnibus GitLab installations**