diff --git a/vm_eval.c b/vm_eval.c
index c83a88f9fa..2e1a9b80a6 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -1473,7 +1473,7 @@ rb_f_loop_size(VALUE self, VALUE args, VALUE eobj)
  *     loop do
  *       print "Input: "
  *       line = gets
- *       break if !line or line =~ /^qQ/
+ *       break if !line or line =~ /^q/i
  *       # ...
  *     end
  *