diff --git a/src/Appwrite/Task/Validator/Cron.php b/src/Appwrite/Task/Validator/Cron.php
index 544482048..03bd1c522 100644
--- a/src/Appwrite/Task/Validator/Cron.php
+++ b/src/Appwrite/Task/Validator/Cron.php
@@ -10,11 +10,11 @@ class Cron extends Validator
     /**
      * Get Description.
      *
-     * Returns validator description
+     * Returns validator description.
      *
      * @return string
      */
-    public function getDescription()
+    public function getDescription(): string
     {
         return 'String must be a valid cron expression';
     }
@@ -28,7 +28,7 @@ class Cron extends Validator
      *
      * @return bool
      */
-    public function isValid($value)
+    public function isValid($value): bool
     {
         if (empty($value)) {
             return true;
@@ -42,7 +42,7 @@ class Cron extends Validator
     }
 
     /**
-     * Is array
+     * Is array.
      *
      * Function will return true if object is array.
      *
@@ -54,7 +54,7 @@ class Cron extends Validator
     }
 
     /**
-     * Get Type
+     * Get Type.
      *
      * Returns validator type.
      *