diff --git a/71.md b/71.md
index 4f07d488..303ec5a3 100644
--- a/71.md
+++ b/71.md
@@ -26,6 +26,11 @@ The primary source of video information is the `imeta` tags which is defined in
 
 Each `imeta` tag can be used to specify a variant of the video by the `dim` & `m` properties.
 
+This NIP defines the following additional `imeta` properties aside form those listen in [NIP-92](92.md) & [NIP-94](94.md):
+
+* `duration` (recommended) the duration of the video/audio in seconds (floating point number)
+* `bitrate` (recommended) the average bitrate of the video/audio in bits/sec
+
 Example:
 ```json
 [
@@ -39,6 +44,8 @@ Example:
     "fallback https://myotherserver.com/1080/12345.mp4",
     "fallback https://andanotherserver.com/1080/12345.mp4",
     "service nip96",
+    "bitrate 3000000",
+    "duration 29.223"
   ],
   ["imeta",
     "dim 1280x720",
@@ -50,6 +57,8 @@ Example:
     "fallback https://myotherserver.com/720/12345.mp4",
     "fallback https://andanotherserver.com/720/12345.mp4",
     "service nip96",
+    "bitrate 2000000",
+    "duration 29.24"
   ],
   ["imeta",
     "dim 1280x720",
@@ -61,6 +70,7 @@ Example:
     "fallback https://myotherserver.com/720/12345.m3u8",
     "fallback https://andanotherserver.com/720/12345.m3u8",
     "service nip96",
+    "duration 29.21"
   ],
 ]
 ```
@@ -74,7 +84,6 @@ 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
@@ -108,7 +117,6 @@ Additionally `service nip96` may be included to allow clients to search the auth
       "service nip96",
     ],
 
-    ["duration", "<duration of video in seconds>"],
     ["text-track", "<encoded `kind 6000` event>", "<recommended relay urls>"],
     ["content-warning", "<reason>"],
     ["segment", <start>, <end>, "<title>", "<thumbnail URL>"],