diff --git a/README.adoc b/README.adoc
index c910508..3e16528 100644
--- a/README.adoc
+++ b/README.adoc
@@ -34,7 +34,7 @@ ytdl_format="bestvideo[height<=1080]+bestaudio/best[height<=1080]"
 
 |===============================================================================
 | *download_dir*  | The directory to which the videos will be downloaded.
-| *keep_for_days* | Delete videos after this many days.
+| *keep_for_days* | Download only videos newer than this many days and delete older videos.
 | *ytdl_format*   | Same syntax as link:{url-ytdl-format}[youtube-dl --format]. Default is "best".
 |===============================================================================