diff --git a/form/create_form_type_extension.rst b/form/create_form_type_extension.rst
index e0bcb69a7fd..7e06b0ad10b 100644
--- a/form/create_form_type_extension.rst
+++ b/form/create_form_type_extension.rst
@@ -128,6 +128,14 @@ The ``extended_type`` key of the tag is the type of field that this extension sh
 be applied to. In your case, as you want to extend the ``Symfony\Component\Form\Extension\Core\Type\FileType``
 field type, you will use that as the ``extended_type``.
 
+.. tip::
+
+    There is an optional tag attribute called ``priority``, which 
+    defaults to ``0`` and controls the order in which the form  
+    type extensions are loaded (the higher the priority, the earlier 
+    an extension is loaded). This is useful when you need to guarantee 
+    that one extension is loaded before or after another extension.
+
 Adding the extension Business Logic
 -----------------------------------