diff --git a/dlibrary/dlibrary.py b/dlibrary/dlibrary.py
index 8868f83..a99a57a 100755
--- a/dlibrary/dlibrary.py
+++ b/dlibrary/dlibrary.py
@@ -69,7 +69,7 @@ TEXTLESS_REGEX = re.compile('(台詞|セリフ|せりふ|テキスト|文字|文
 FXLESS_REGEX = re.compile('効果音(な|無)し', re.I)
 FRONT_COVER_REGEX = re.compile('(?<!裏)表紙(?!裏)|(?<!back[-_ ])(?<!back)cover|(?<!ura[-_ ])(?<!ura)hyou?sh?i(?![-_ ]?ura)', re.I)
 BACK_COVER_REGEX = re.compile('裏表紙|hyou?sh?i[-_ ]?ura|ura[-_ ]?hyou?sh?i', re.I)
-BONUS_REGEX = re.compile('設定|キャラ|特典|ポスター|bonus', re.I)
+BONUS_REGEX = re.compile('設定|キャラ|特典|ポスター|bonus|描き下ろし', re.I)
 EPILOGUE_REGEX = re.compile('after|後日談|おまけ|omake|オマケ', re.I)
 AFTERWORD_REGEX = re.compile('あとがき', re.I)
 SPLITS = [