1 files changed, 1 insertions, 0 deletions

diff --git a/README.md b/README.md
index 42cbc0c..c88d949 100644
--- a/README.md
+++ b/README.md
@@ -92,6 +92,7 @@ When experimenting with kinds, keep in mind the classification introduced by [NI
 | ---------- | ----------------------- | ----------------- | ------------------------ |
 | e          | event id (hex)          | relay URL, marker | [1](01.md), [10](10.md)  |
 | p          | pubkey (hex)            | relay URL         | [1](01.md)               |
+| a          | coordinates to an event | relay URL         | [33](33.md), [23](23.md) |
 | r          | a reference (URL, etc)  |                   | [12](12.md)              |
 | t          | hashtag                 |                   | [12](12.md)              |
 | g          | geohash                 |                   | [12](12.md)              |