diff --git a/SPEC.md b/SPEC.md
index 950cacc..9293251 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -338,6 +338,6 @@ bom := '\u{FFEF}'
 
 unicode-space := See Table (All White_Space unicode characters which are not `newline`)
 
-single-line-comment := '//' ('\r' [^\n] | [^\r\n])* newline
+single-line-comment := '//' ^newline+ newline
 multi-line-comment := '/*' ('*' [^\/] | [^*])* '*/'
 ```