add kind 10009 for public list of simple groups.

1 files changed, 4 insertions, 0 deletions

diff --git a/29.md b/29.md
index 5b29d99..de60ad5 100644
--- a/29.md
+++ b/29.md
@@ -200,3 +200,7 @@ It's a NIP-51-like list of pubkeys that are members of the group. Relays might c
   ]
 }
 ```
+
+## Storing the list of groups a user belongs to
+
+A definition for kind `10009` was included in [NIP-51](51.md) that allows clients to store the list of groups a user wants to remember being in.