diff --git a/pep-3129.txt b/pep-3129.txt
index 874ebd1b3..26c050934 100644
--- a/pep-3129.txt
+++ b/pep-3129.txt
@@ -65,13 +65,25 @@ For a detailed examination of decorators, please refer to PEP 318.
 Implementation
 ==============
 
-The grammar for class declarations changes from ::
+Adapating Python's grammar to support class decorators requires
+modifying two rules and adding a new rule ::
 
-  classdef: 'class' NAME ['(' [testlist] ')'] ':' suite
-  
-to ::
+ funcdef: [decorators] 'def' NAME parameters ['->' test] ':' suite
+ 
+ compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt |
+                with_stmt | funcdef | classdef
+                
+need to be changed to ::
+ 
+ decorated: decorators (classdef | funcdef)
 
-  classdef: [decorators] 'class' NAME ['(' [testlist] ')'] ':' suite
+ funcdef: 'def' NAME parameters ['->' test] ':' suite
+ 
+ compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt |
+                with_stmt | funcdef | classdef | decorated
+
+Adding ``decorated`` is necessary to avoid an ambiguity in the
+grammar.
 
 The Python AST and bytecode must be modified accordingly.