diff --git a/README b/README
index 57f5c9a..86e0070 100644
--- a/README
+++ b/README
@@ -30,6 +30,11 @@ Add mellon urls to your urls::
         url(r'^/accounts/mellon/', include('mellon.urls')),
     )
 
+Please note that from django 3.2 onwards, a registered AdminSite app embeds a
+url-routing catch-all option (AdminSite.final_catch_all_view) that is activated
+by default and that may collide with the django-mellon app if its url routing
+is declared before mellon's url routing.
+
 If SAML 2.0 should be your only authentication method you can define `mellon_login` as you main `LOGIN_URL`::
 
     LOGIN_URL = 'mellon_login'