diff --git a/string.c b/string.c
index 0ce8c40ecb..b3dba9c76f 100644
--- a/string.c
+++ b/string.c
@@ -9015,6 +9015,7 @@ rb_str_strip_bang(VALUE str)
  *
  *     "    hello    ".strip   #=> "hello"
  *     "\tgoodbye\r\n".strip   #=> "goodbye"
+ *     "hello".strip           #=> "hello"
  *     "\x00\t\n\v\f\r ".strip #=> ""
  */