Update comment

roles/matrix-nginx-proxy/defaults/main.yml

@@ -154,6 +154,7 @@ matrix_nginx_proxy_proxy_matrix_client_api_client_max_body_size_mb: 50
 matrix_nginx_proxy_proxy_matrix_client_api_forwarded_location_synapse_client_api_enabled: true
 
 # Tells whether `/_synapse/oidc` is forwarded to the Matrix Client API server.
+# Enable this if you need OpenID Connect authentication support.
 matrix_nginx_proxy_proxy_matrix_client_api_forwarded_location_synapse_oidc_api_enabled: false
 
 # Tells whether `/_synapse/admin` is forwarded to the Matrix Client API server.