diff --git a/string.c b/string.c
index 3c27646d5e..470bc59b76 100644
--- a/string.c
+++ b/string.c
@@ -82,7 +82,6 @@ VALUE rb_cSymbol;
  *
  * 1:     RSTRING_NOEMBED
  * 2:     STR_SHARED (== ELTS_SHARED)
- * 2-6:   RSTRING_EMBED_LEN (5 bits == 32)
  * 5:     STR_SHARED_ROOT (RSTRING_NOEMBED==1 && STR_SHARED == 0, there may be
  *                         other strings that rely on this string's buffer)
  * 6:     STR_BORROWED (when RSTRING_NOEMBED==1 && klass==0, unsafe to recycle