diff --git a/app/controllers/api/databases.php b/app/controllers/api/databases.php
index cc1290b77c..6cbf7268bd 100644
--- a/app/controllers/api/databases.php
+++ b/app/controllers/api/databases.php
@@ -1650,8 +1650,7 @@ App::post('/v1/databases/:databaseId/collections/:collectionId/attributes/relati
                 \strtolower($attribute->getAttribute('options')['twoWayKey']) === \strtolower($twoWayKey) &&
                 $attribute->getAttribute('options')['relatedCollection'] === $relatedCollection->getId()
             ) {
-                // Currently, we always throw an Exception even when, We do not want to change $twoWayKsy on $twoWayKeyNull
-                throw new Exception(Exception::ATTRIBUTE_ALREADY_EXISTS);
+                throw new Exception(Exception::ATTRIBUTE_ALREADY_EXISTS, 'Creating more than one "manyToMany" relationship on the same collection is currently not permitted.');
             }
 
             if (