diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index 15f26d41b..df685da5d 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -747,6 +747,9 @@
     <string name="add_public_comment">Add a public comment</string>
     <string name="send_comment">Send comment</string>
     <string name="toast_toot_saved_error">There is no Internet connection. Your message has been stored in drafts.</string>
+    <string name="action_plain_text">Plain text</string>
+    <string name="action_html">HTML</string>
+    <string name="action_markdown">Markdown</string>
     <!-- end languages -->
     <string-array name="settings_video_mode">
         <item>Webview</item>