diff --git a/conf/defaults.ini b/conf/defaults.ini
index 3caa116d02a..6690cbe3f7b 100644
--- a/conf/defaults.ini
+++ b/conf/defaults.ini
@@ -1264,11 +1264,12 @@ clean_upgrade = false
 enabled = false
 
 # URL of the remote Alertmanager that will replace the internal one.
+# This URL should be the root path, Grafana will automatically append an "/alertmanager" suffix for certain HTTP calls.
 # Required if `enabled` is set to `true`.
 url =
 
 # Tenant ID to use in requests to the Alertmanager.
-# It will also be used for the basic auth username.
+# It will also be used for the basic auth username if a password is configured.
 tenant =
 
 # Optional password for basic authentication.