diff --git a/lib/unicode_normalize.rb b/lib/unicode_normalize.rb
index 8daf7b301a..72478fade3 100644
--- a/lib/unicode_normalize.rb
+++ b/lib/unicode_normalize.rb
@@ -3,7 +3,9 @@
 
 # Copyright Ayumu Nojima (野島 歩) and Martin J. Dürst (duerst@it.aoyama.ac.jp)
 
+#--
 # additions to class String for Unicode normalization
+#++
 class String
   # === Unicode Normalization
   #