diff --git a/README.md b/README.md
index e430f13091..d5b6219fe3 100644
--- a/README.md
+++ b/README.md
@@ -180,6 +180,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 | `30617`       | Repository announcements   | [34](34.md)              |
 | `30818`       | Wiki article               | [54](54.md)              |
 | `30819`       | Redirects                  | [54](54.md)              |
+| `31890`       | Feed                       | [NUD: Custom Feeds](https://wikifreedia.xyz/cip-01/97c70a44366a6535c1)              |
 | `31922`       | Date-Based Calendar Event  | [52](52.md)              |
 | `31923`       | Time-Based Calendar Event  | [52](52.md)              |
 | `31924`       | Calendar                   | [52](52.md)              |
@@ -192,6 +193,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 | `34550`       | Community Definition       | [72](72.md)              |
 | `39000-9`     | Group metadata events      | [29](29.md)              |
 
+[NUD: Custom Feeds]: https://wikifreedia.xyz/cip-01/97c70a44366a6535c1
 [nostrocket]: https://github.com/nostrocket/NIPS/blob/main/Problems.md
 [lnpub]: https://github.com/shocknet/Lightning.Pub/blob/master/proto/autogenerated/client.md