diff --git a/backend-php/api.php b/backend-php/api.php
index 4448a93..8c27be8 100644
--- a/backend-php/api.php
+++ b/backend-php/api.php
@@ -362,7 +362,7 @@ CreateApi(function ($api) {
                 FastDBReq($db, 'DELETE FROM rings WHERE classId=? AND fromDate=?', [$classId, $day]);
                 break;
             default:
-                return "you saved your live because you did'n know what tabs are here";
+                return "you saved your live because you didn't know what tabs are here";
         }
         $db = null;
         return true;