diff -r 84beb5cba826 Doc/reference/compound_stmts.rst
--- a/Doc/reference/compound_stmts.rst	Wed Dec 28 15:43:08 2016 -0800
+++ b/Doc/reference/compound_stmts.rst	Thu Dec 29 14:31:10 2016 +0200
@@ -472,7 +472,7 @@
    decorator: "@" `dotted_name` ["(" [`argument_list` [","]] ")"] NEWLINE
    dotted_name: `identifier` ("." `identifier`)*
    parameter_list: (`defparameter` ",")*
-                 : | "*" [`parameter`] ("," `defparameter`)* ["," "**" `parameter`]
+                 : ( "*" [`parameter`] ("," `defparameter`)+ ["," "**" `parameter`]
                  : | "**" `parameter`
                  : | `defparameter` [","] )
    parameter: `identifier` [":" `expression`]