diff --git a/Enabling-SSO-support-using-OpenId-Connect.md b/Enabling-SSO-support-using-OpenId-Connect.md
index bc50712..dd436b3 100644
--- a/Enabling-SSO-support-using-OpenId-Connect.md
+++ b/Enabling-SSO-support-using-OpenId-Connect.md
@@ -145,6 +145,8 @@ Server configuration should look like:
 - `SSO_CLIENT_ID`
 - `SSO_CLIENT_SECRET`
 
+:warning: The trailing `/` of the `SSO_AUTHORITY` means that when building the full URL for the configuration endpoint it will include a double `/`: `https://${domain}/application/o/${application_name}//.well-known/openid-configuration`. This can cause issues with some proxy.
+
 ## Casdoor
 
 Since version [v1.639.0](https://github.com/casdoor/casdoor/releases/tag/v1.639.0) should work (Tested with version [v1.686.0](https://github.com/casdoor/casdoor/releases/tag/v1.686.0)).