diff --git a/lib/realm.js b/lib/realm.js
index 6f1a3665..0c4b072c 100644
--- a/lib/realm.js
+++ b/lib/realm.js
@@ -48,7 +48,7 @@ class Realm {
             throw new TypeError('addNotification method was not called on a Realm object!');
         }
         if (typeof callback != 'function') {
-            throw new Error('Realm.addNotification must be passed function!');
+            throw new Error('Realm.addNotification must be passed a function!');
         }
 
         let notification = rpc.callRealmMethod(realmId, 'addNotification', [callback]);