diff --git a/mrbgems/mruby-numeric-ext/test/numeric.rb b/mrbgems/mruby-numeric-ext/test/numeric.rb
index 0132e5559..6c1cf0fce 100644
--- a/mrbgems/mruby-numeric-ext/test/numeric.rb
+++ b/mrbgems/mruby-numeric-ext/test/numeric.rb
@@ -5,6 +5,6 @@ assert('Integer#chr') do
   assert_equal(65.chr, "A")
   assert_equal(0x42.chr, "B")
 
-  # encoding multibyte (not support yet)
+  # multibyte encoding (not support yet)
   assert_raise(RangeError) { 12345.chr }
 end