diff --git a/51.md b/51.md
index cbd6be11..e4d7c24e 100644
--- a/51.md
+++ b/51.md
@@ -129,6 +129,7 @@ Then the user would create a 'Categorized Bookmarks' list event like below:
 | 10001  | Pin                     |
 | 30000  | Categorized People      |
 | 30001  | Categorized Bookmarks   |
+| 30002  | Categorized Relay Sets  |
 
 
 ### Mute List
@@ -145,4 +146,8 @@ An event with kind `30000` is defined as a parameterized replaceable list event
 
 ### Categorized Bookmarks List
 
-An event of kind `30001` is defined as a parameterized replaceable list event for categorizing bookmarks. The 'd' parameter for this event holds the category name of the list. The bookmark lists may contain metadata tags such as 'title', 'image', 'summary' as defined in [NIP-23 - Long-form Content](23.md). Any standardized tag can be included in a Categorized Bookmark List.
\ No newline at end of file
+An event of kind `30001` is defined as a parameterized replaceable list event for categorizing bookmarks. The 'd' parameter for this event holds the category name of the list. The bookmark lists may contain metadata tags such as 'title', 'image', 'summary' as defined in [NIP-23 - Long-form Content](23.md). Any standardized tag can be included in a Categorized Bookmark List.
+
+### Categorized Relay Set
+
+An event of kind `30002` is defined as a parameterized replaceable list event for categorizing relays. The 'd' parameter for this event holds the category name of the list. The relays lists may contain metadata tags such as 'title', 'image', 'summary' as defined in [NIP-23 - Long-form Content](23.md). These sets can be used by clients in order to determine which relays to query in different scenarios.