diff --git a/51.md b/51.md
index ab15be48..bcab8b8d 100644
--- a/51.md
+++ b/51.md
@@ -34,6 +34,7 @@ their feeds or receive annoying notifications from.
 | Public chats   | 10005 | [NIP-28](28.md) chat channels the user is in                | `"e"` (kind:40 community definitions)                                             |
 | Blocked relays | 10006 | relays clients should never connect to                      | `"relay"` (relay URLs)                                                            |
 | Search relays  | 10007 | relays clients should use when performing search queries    | `"relay"` (relay URLs)                                                            |
+| Interests      | 10015 | topics a user may be interested in and pointers             | `"t"` (hashtags) and `"a" (kind:30015 interest set)`                              |
 | Emojis         | 10030 | user preferred emojis and pointers to emoji sets            | `"emoji"` (see [NIP-30](30.md)) and `"a"` (kind:30030 emoji set)                  |
 
 ## Sets
@@ -55,6 +56,7 @@ Aside from their main identifier, the `"d"` tag, sets can optionally have a `"na
 | Relay sets    | 30002 | user-defined relay groups the user can easily pick and choose from during various operations | `"relay"` (relay URLs)                                                            |
 | Bookmark sets | 30003 | user-defined bookmarks categories , for when bookmarks must be in labeled separate groups    | `"e"` (kind:1 notes), `"a"` (kind:30023 articles), `"t"` (hashtags), `"r" (URLs)` |
 | Curation sets | 30004 | groups of articles picked by users as interesting and/or belonging to the same category      | `"a"` (kind:30023 articles), `"e"` (kind:1 notes)                                 |
+| Interest sets | 30015 | interest topics represented by a bunch of "hashtags"                                         | `"t"` (hashtags)                                                                  |
 | Emoji sets    | 30030 | categorized emoji groups                                                                     | `"emoji"` (see [NIP-30](30.md))                                                   |
 
 ## Deprecated standard lists
diff --git a/README.md b/README.md
index 36d5fc07..790f0b6a 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 | `10005`       | Public chats list          | [51](51.md)                        |
 | `10006`       | Blocked relays list        | [51](51.md)                        |
 | `10007`       | Search relays list         | [51](51.md)                        |
+| `10015`       | Interests list             | [51](51.md)                        |
 | `10030`       | User emoji list            | [51](51.md)                        |
 | `13194`       | Wallet Info                | [47](47.md)                        |
 | `22242`       | Client Authentication      | [42](42.md)                        |
@@ -127,6 +128,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 | `30004`       | Curation sets              | [51](51.md)                        |
 | `30008`       | Profile Badges             | [58](58.md)                        |
 | `30009`       | Badge Definition           | [58](58.md)                        |
+| `30015`       | Interest sets              | [51](51.md)                        |
 | `30030`       | Emoji sets                 | [51](51.md)                        |
 | `30017`       | Create or update a stall   | [15](15.md)                        |
 | `30018`       | Create or update a product | [15](15.md)                        |