diff --git a/RationaleMCP/0031/grammar.md b/RationaleMCP/0031/grammar.md
index 069fddf8c..0ee05bb65 100644
--- a/RationaleMCP/0031/grammar.md
+++ b/RationaleMCP/0031/grammar.md
@@ -138,7 +138,7 @@ Note that there is no optional byte order mark, in agreement with the use of byt
 >   ~~| **protected** (_generic-element_ **;**)*~~ \
 >   )* \
 >   ( _decoration_? **external** _language-specification_?\
->    _external-function-call_? _annotation-comment_? **;**\
+>    _external-function-call_~~?~~ _annotation-comment_? **;**\
 >   )?\
 >   _base-partition_* \
 >   ( _annotation-comment_ **;** )?