diff --git a/doc/settings/configuration.md b/doc/settings/configuration.md
index 3097e129b4ab2e782af5e8e7cea62eb271a344f7_ZG9jL3NldHRpbmdzL2NvbmZpZ3VyYXRpb24ubWQ=..1f2047408ff8d07f1d41ba479ea237078f84a3da_ZG9jL3NldHRpbmdzL2NvbmZpZ3VyYXRpb24ubWQ= 100644
--- a/doc/settings/configuration.md
+++ b/doc/settings/configuration.md
@@ -11,6 +11,13 @@
 
 ## Configuring the external URL for GitLab
 
+NOTE: **Note:**
+Before you change the external URL, you should check if you have
+previously defined a custom **Home page URL** or **After sign out path** under
+**Admin Area > Settings > General > Sign-in restrictions**. If URLs have been
+defined, either update them or remove them completely. Both of these settings
+might cause unintentional redirecting after configuring a new external URL.
+
 In order for GitLab to display correct repository clone links to your users
 it needs to know the URL under which it is reached by your users, e.g.
 `http://gitlab.example.com`. Add or edit the following line in