diff --git a/doc/specs/idl.md b/doc/specs/idl.md
index 9798ab6..456b777 100644
--- a/doc/specs/idl.md
+++ b/doc/specs/idl.md
@@ -166,7 +166,7 @@
 
     [28] SetType         ::=  'set' CppType? '<' FieldType '>'
 
-    [29] ListType        ::=  'list' '<' FieldType '>' CppType?
+    [29] ListType        ::=  'list' CppType? '<' FieldType '>' 
 
     [30] CppType         ::=  'cpp_type' Literal