diff --git a/71.md b/71.md
index fe7db2ec..23872d30 100644
--- a/71.md
+++ b/71.md
@@ -82,7 +82,6 @@ Additionally `service nip96` may be included to allow clients to search the auth
 ### Other tags:
 * `title` (required) title of the video
 * `published_at`, for the timestamp in unix seconds (stringified) of the first time the video was published
-* `duration` (optional) video duration in seconds
 * `text-track` (optional, repeated) link to WebVTT file for video, type of supplementary information (captions/subtitles/chapters/metadata), optional language code
 * `content-warning` (optional) warning about content of NSFW video
 * `alt` (optional) description for accessibility