diff --git a/console/lockable_trait.rst b/console/lockable_trait.rst
index 7f751d09012..74c4c2a5870 100644
--- a/console/lockable_trait.rst
+++ b/console/lockable_trait.rst
@@ -38,6 +38,8 @@ that adds two convenient methods to lock and release commands::
             // if not released explicitly, Symfony releases the lock
             // automatically when the execution of the command ends
             $this->release();
+            
+            return 0;
         }
     }