diff --git a/51.md b/51.md
index 3792d7fe..1a238913 100644
--- a/51.md
+++ b/51.md
@@ -20,21 +20,22 @@ Standard lists use normal replaceable events, meaning users may only have a sing
 
 For example, _mute list_ can contain the public keys of spammers and bad actors users don't want to see in their feeds or receive annoying notifications from.
 
-| name              | kind  | description                                                 | expected tag items                                                                |
-| ---               | ---   | ---                                                         | ---                                                                               |
-| Mute list         | 10000 | things the user doesn't want to see in their feeds          | `"p"` (pubkeys), `"t"` (hashtags), `"word"` (lowercase string), `"e"` (threads)   |
-| Pinned notes      | 10001 | events the user intends to showcase in their profile page   | `"e"` (kind:1 notes)                                                              |
-| Bookmarks         | 10003 | uncategorized, "global" list of things a user wants to save | `"e"` (kind:1 notes), `"a"` (kind:30023 articles), `"t"` (hashtags), `"r"` (URLs) |
-| Communities       | 10004 | [NIP-72](72.md) communities the user belongs to             | `"a"` (kind:34550 community definitions)                                          |
-| Public chats      | 10005 | [NIP-28](28.md) chat channels the user is in                | `"e"` (kind:40 channel 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)                                                            |
-| Simple groups     | 10009 | [NIP-29](29.md) groups the user is in                       | `"group"` ([NIP-29](29.md) group ids + mandatory relay URL)                       |
-| 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)                  |
-| DM relays         | 10050 | Where to receive [NIP-17](17.md) direct messages            | `"relay"` (see [NIP-17](17.md))                                                   |
-| Good wiki authors | 10101 | [NIP-54](54.md) user recommended wiki authors               | `"p"` (pubkeys)                                                                   |
-| Good wiki relays  | 10102 | [NIP-54](54.md) relays deemed to only host useful articles  | `"relay"` (relay URLs)                                                            |
+| name              | kind  | description                                                           | expected tag items                                                                |
+| ---               | ---   | ---                                                                   | ---                                                                               |
+| Mute list         | 10000 | things the user doesn't want to see in their feeds                    | `"p"` (pubkeys), `"t"` (hashtags), `"word"` (lowercase string), `"e"` (threads)   |
+| Pinned notes      | 10001 | events the user intends to showcase in their profile page             | `"e"` (kind:1 notes)                                                              |
+| Bookmarks         | 10003 | uncategorized, "global" list of things a user wants to save           | `"e"` (kind:1 notes), `"a"` (kind:30023 articles), `"t"` (hashtags), `"r"` (URLs) |
+| Communities       | 10004 | [NIP-72](72.md) communities the user belongs to                       | `"a"` (kind:34550 community definitions)                                          |
+| Public chats      | 10005 | [NIP-28](28.md) chat channels the user is in                          | `"e"` (kind:40 channel 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)                                                            |
+| Simple groups     | 10009 | [NIP-29](29.md) groups the user is in                                 | `"group"` ([NIP-29](29.md) group ids + mandatory relay URL)                       |
+| 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)                  |
+| DM relays         | 10050 | Where to receive [NIP-17](17.md) direct messages                      | `"relay"` (see [NIP-17](17.md))                                                   |
+| Good wiki authors | 10101 | [NIP-54](54.md) user recommended wiki authors                         | `"p"` (pubkeys)                                                                   |
+| Good wiki relays  | 10102 | [NIP-54](54.md) relays deemed to only host useful articles            | `"relay"` (relay URLs)                                                            |
+| Cart/wishlist     | 10402 | [NIP-99](99.md) listings the user wants to purchase or have purchased | `"listing"` (listing IDs)                                                         |
 
 ## Sets