1 files changed, 2 insertions, 1 deletions
diff --git a/kernel.rb b/kernel.rb
index 888ef0c531..dc5cea1515 100644
--- a/kernel.rb
+++ b/kernel.rb
@@ -17,7 +17,7 @@ module Kernel
   #
   def class
     Primitive.attr! :leaf
-    Primitive.cexpr! 'rb_obj_class(self)'
+    Primitive.cexpr! 'rb_obj_class_must(self)'
   end
 
   #
@@ -141,6 +141,7 @@ module Kernel
   #    loop do
   #      print "Input: "
   #      line = gets
+  #      # break if q, Q is entered or EOF signal (Ctrl-D on Unix, Ctrl-Z on windows) is sent
   #      break if !line or line =~ /^q/i
   #      # ...
   #    end