diff --git a/Mage.Server/src/main/java/mage/server/Session.java b/Mage.Server/src/main/java/mage/server/Session.java
index 88dccf4912..602281c4e8 100644
--- a/Mage.Server/src/main/java/mage/server/Session.java
+++ b/Mage.Server/src/main/java/mage/server/Session.java
@@ -183,7 +183,7 @@ public class Session {
         if (ConfigSettings.getInstance().isAuthenticationActivated()) {
             AuthorizedUser authorizedUser = AuthorizedUserRepository.instance.getByName(userName);
             if (authorizedUser == null || !authorizedUser.doCredentialsMatch(userName, password)) {
-                return "Wrong username or password";
+                return "Wrong username or password. In case you haven't, please register your account first.";
             }
         }