diff --git a/lib/irb/slex.rb b/lib/irb/slex.rb
index 68174771a7..039b214a8d 100644
--- a/lib/irb/slex.rb
+++ b/lib/irb/slex.rb
@@ -53,7 +53,7 @@ module IRB
       node.preproc=proc
     end
 
-    #要チェック?
+    # need a check?
     def postproc(token)
       node = search(token, proc)
       node.postproc=proc