diff --git a/SPEC.md b/SPEC.md
index cfb65cf..c3ed4f7 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -376,6 +376,6 @@ bom := '\u{FFEF}'
 unicode-space := See Table (All White_Space unicode characters which are not `newline`)
 
 single-line-comment := '//' ^newline+ newline
-multi-line-comment := '/*' (commented-block | multi-line-comment) '*/'
-commented-block := ('*' [^\/] | [^*])*
+multi-line-comment := '/*' commented-block
+commented-block := '*/' | (multi-line-comment | '*' | '/' | [^*/]+) commented-block
 ```