diff --git a/function/heroku.php b/function/heroku.php
index 7e1daa5..7957b8c 100644
--- a/function/heroku.php
+++ b/function/heroku.php
@@ -206,7 +206,7 @@ function_name:' . $_SERVER['function_name'] . '<br>
             }
             envs = [' . $envs . '];
             if (envs.indexOf(t.disktag_add.value)>-1) {
-                alert(\'' . $envs . '\');
+                alert("Do not input ' . $envs . '");
                 return false;
             }
             var reg = /^[a-zA-Z]([-_a-zA-Z0-9]{1,20})$/;