[book][forms] Tweaking good note about property_path

weaverryan · weaverryan · commit 706119c3ca2e · 2012-02-08T00:26:37.000-06:00
diff --git a/book/forms.rst b/book/forms.rst
@@ -794,20 +794,23 @@ the choice is ultimately up to you.
 
 .. tip::
 	
-	When mapping forms to objects, all fields are mapped, any fields on the 
+	When mapping forms to objects, all fields are mapped. Any fields on the 
 	form that do not exist on the mapped object will cause an exception to
 	be thrown.
 	
 	In cases where you need extra fields in the form (for example: a "do you
-	agree with these terms" checkbox) that will not be mapped to the undelying
-	object, you need to set the property_path setting to ``false``.
+	agree with these terms" checkbox) that will not be mapped to the underlying
+	object, you need to set the property_path option to ``false``::
 	
         public function buildForm(FormBuilder $builder, array $options)
         {
             $builder->add('task');
             $builder->add('dueDate', null, array('property_path' => false));
         }
 
+    Additionally, if there are any fields on the form that aren't included in
+    the submitted data, those fields will be explicitly set to ``null``.
+
 .. index::
    pair: Forms; Doctrine
 
