README.md in jisx0208-0.4.0 vs README.md in jisx0208-0.4.1

@@ -19,11 +19,12 @@
 code.contains_first_level_kanji?("弌") # => false
 code.contains_seconde_level_kanji?("弌") # => true
 code.contains_seconde_level_kanji?("亜") # => false
 # same as (contains_first_level_kanji || contains_seconde_level_kanji)
 code.contains_jisx0208_kanji?("亜弌") # => true
-
 code.only_first_level_kanji?("回転寿司") # => true
 code.only_second_level_kanji?("偃龠偕") # => true
-# same as (only_first_level_kanji || only_second_level_kanji)
+# only (first level kanji + second level kanji)
 code.only_jisx0208_kanji?("回転寿司偃龠偕") # => true
+# hiragana, katakana, multi byte symbols + first level kanji
+code.only_common_japanese_characters?("呪術廻戦は最高！") # => true
 ```