diff --git a/README.md b/README.md
index 1e69602..6011577 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ optional arguments:
   -fs SIZE, --fontsize SIZE
                         Default font size [default: 25]
   -a ALPHA, --alpha ALPHA
-                        Text opaque
+                        Text opacity
   -l SECONDS, --lifetime SECONDS
                         Duration of comment display [default: 5]
   -p HEIGHT, --protect HEIGHT
diff --git a/danmaku2ass.py b/danmaku2ass.py
index 93f8943..0cf51f4 100755
--- a/danmaku2ass.py
+++ b/danmaku2ass.py
@@ -735,7 +735,7 @@ def main():
     parser.add_argument('-s', '--size', metavar=_('WIDTHxHEIGHT'), required=True, help=_('Stage size in pixels'))
     parser.add_argument('-fn', '--font', metavar=_('FONT'), help=_('Specify font face [default: %s]') % _('(FONT) sans-serif')[7:], default=_('(FONT) sans-serif')[7:])
     parser.add_argument('-fs', '--fontsize', metavar=_('SIZE'), help=(_('Default font size [default: %s]') % 25), type=float, default=25.0)
-    parser.add_argument('-a', '--alpha', metavar=_('ALPHA'), help=_('Text opaque'), type=float, default=1.0)
+    parser.add_argument('-a', '--alpha', metavar=_('ALPHA'), help=_('Text opacity'), type=float, default=1.0)
     parser.add_argument('-l', '--lifetime', metavar=_('SECONDS'), help=_('Duration of comment display [default: %s]') % 5, type=float, default=5.0)
     parser.add_argument('-p', '--protect', metavar=_('HEIGHT'), help=_('Reserve blank on the bottom of the stage'), type=int, default=0)
     parser.add_argument('-r', '--reduce', action='store_true', help=_('Reduce the amount of comments if stage is full'))
diff --git a/locale/en/LC_MESSAGES/danmaku2ass.mo b/locale/en/LC_MESSAGES/danmaku2ass.mo
index 23849ca..fe0f833 100644
Binary files a/locale/en/LC_MESSAGES/danmaku2ass.mo and b/locale/en/LC_MESSAGES/danmaku2ass.mo differ
diff --git a/locale/en/LC_MESSAGES/danmaku2ass.po b/locale/en/LC_MESSAGES/danmaku2ass.po
index 5ad507a..ed20d8d 100644
--- a/locale/en/LC_MESSAGES/danmaku2ass.po
+++ b/locale/en/LC_MESSAGES/danmaku2ass.po
@@ -68,8 +68,8 @@ msgid "ALPHA"
 msgstr "ALPHA"
 
 #: danmaku2ass.py:738
-msgid "Text opaque"
-msgstr "Text opaque"
+msgid "Text opacity"
+msgstr "Text opacity"
 
 #: danmaku2ass.py:739
 msgid "SECONDS"
diff --git a/locale/ja/LC_MESSAGES/danmaku2ass.mo b/locale/ja/LC_MESSAGES/danmaku2ass.mo
index dbba55a..9aa99a3 100644
Binary files a/locale/ja/LC_MESSAGES/danmaku2ass.mo and b/locale/ja/LC_MESSAGES/danmaku2ass.mo differ
diff --git a/locale/ja/LC_MESSAGES/danmaku2ass.po b/locale/ja/LC_MESSAGES/danmaku2ass.po
index 9c3b0cc..af48765 100644
--- a/locale/ja/LC_MESSAGES/danmaku2ass.po
+++ b/locale/ja/LC_MESSAGES/danmaku2ass.po
@@ -68,7 +68,7 @@ msgid "ALPHA"
 msgstr "アルファ"
 
 #: danmaku2ass.py:738
-msgid "Text opaque"
+msgid "Text opacity"
 msgstr "テキストの不透明度"
 
 #: danmaku2ass.py:739
diff --git a/locale/zh_CN/LC_MESSAGES/danmaku2ass.mo b/locale/zh_CN/LC_MESSAGES/danmaku2ass.mo
index 7758444..b2053f0 100644
Binary files a/locale/zh_CN/LC_MESSAGES/danmaku2ass.mo and b/locale/zh_CN/LC_MESSAGES/danmaku2ass.mo differ
diff --git a/locale/zh_CN/LC_MESSAGES/danmaku2ass.po b/locale/zh_CN/LC_MESSAGES/danmaku2ass.po
index dcfb399..1d0a7ad 100644
--- a/locale/zh_CN/LC_MESSAGES/danmaku2ass.po
+++ b/locale/zh_CN/LC_MESSAGES/danmaku2ass.po
@@ -68,7 +68,7 @@ msgid "ALPHA"
 msgstr "ALPHA"
 
 #: danmaku2ass.py:738
-msgid "Text opaque"
+msgid "Text opacity"
 msgstr "文字不透明度"
 
 #: danmaku2ass.py:739
diff --git a/locale/zh_TW/LC_MESSAGES/danmaku2ass.mo b/locale/zh_TW/LC_MESSAGES/danmaku2ass.mo
index 994a848..af2fb2e 100644
Binary files a/locale/zh_TW/LC_MESSAGES/danmaku2ass.mo and b/locale/zh_TW/LC_MESSAGES/danmaku2ass.mo differ
diff --git a/locale/zh_TW/LC_MESSAGES/danmaku2ass.po b/locale/zh_TW/LC_MESSAGES/danmaku2ass.po
index 17dd8f3..dcc23a1 100644
--- a/locale/zh_TW/LC_MESSAGES/danmaku2ass.po
+++ b/locale/zh_TW/LC_MESSAGES/danmaku2ass.po
@@ -68,7 +68,7 @@ msgid "ALPHA"
 msgstr "ALPHA"
 
 #: danmaku2ass.py:738
-msgid "Text opaque"
+msgid "Text opacity"
 msgstr "文字不透明度"
 
 #: danmaku2ass.py:739