diff --git a/LegitimateURLShortener.txt b/LegitimateURLShortener.txt
index 7e9c9f46d..3196036c9 100644
--- a/LegitimateURLShortener.txt
+++ b/LegitimateURLShortener.txt
@@ -3479,6 +3479,7 @@ $removeparam=session_id,domain=reddit.app.link
 $removeparam=loid,domain=reddit.app.link
 $removeparam=loid_created,domain=reddit.app.link
 $removeparam=reddaid,domain=reddit.app.link
+! can't remove from YouTube: https://github.com/DandelionSprout/adfilt/issues/931
 $doc,removeparam=feature,domain=reddit.app.link
 $removeparam=keyword,domain=reddit.app.link
 $removeparam=mweb_subreddit_ids,domain=reddit.app.link