diff --git a/Autocoders/Python/schema/default/serializable_schema.rng b/Autocoders/Python/schema/default/serializable_schema.rng
index 581625bef6..f74ddef6c1 100644
--- a/Autocoders/Python/schema/default/serializable_schema.rng
+++ b/Autocoders/Python/schema/default/serializable_schema.rng
@@ -91,6 +91,8 @@
         <element name="member">
             <a:documentation>Item define in the serializable object.</a:documentation>
 
+            <!-- Optional element -->
+
             <optional>
                 <a:documentation>Optional default value.</a:documentation>
                 <element name="default">
@@ -121,8 +123,6 @@
                 </attribute>
             </optional>
 
-            
-
             <!-- Type, size, and internal enum define are defined within this ref -->
             <ref name="type_size_choice_define"/>
         </element>