diff --git a/README.md b/README.md
index a91d7575..2b305a95 100644
--- a/README.md
+++ b/README.md
@@ -354,6 +354,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 | `expiration`      | unix timestamp (string)              | --                              | [40](40.md)                                        |
 | `file`            | full path (string)                   | --                              | [35](35.md)                                        |
 | `goal`            | event id (hex)                       | relay URL                       | [75](75.md)                                        |
+| `HEAD`            | `ref: refs/heads/<branch-name>`      |                                 | [34](34.md)                                        |
 | `image`           | image URL                            | dimensions in pixels            | [23](23.md), [52](52.md), [58](58.md)              |
 | `imeta`           | inline metadata                      | --                              | [92](92.md)                                        |
 | `license`         | License of the shared content        | --                              | [C0](C0.md)                                        |