diff --git a/src/ReadOnlyTrait.php b/src/ReadOnlyTrait.php
index f88fb63..52533b8 100644
--- a/src/ReadOnlyTrait.php
+++ b/src/ReadOnlyTrait.php
@@ -158,9 +158,10 @@ trait ReadOnlyTrait
 
     /**
      * Throws ReadOnlyException on touch
+     * @param  string|null  $attribute
      * @throws ReadOnlyException
      */
-    public function touch()
+    public function touch($attribute = null)
     {
         throw new ReadOnlyException(__FUNCTION__, get_called_class());
     }