diff --git a/86.md b/86.md
index c4d60276..d7284326 100644
--- a/86.md
+++ b/86.md
@@ -82,3 +82,7 @@ This is the list of **methods** that may be supported:
 * `listblockedips`:
   - params: `[]`
   - result: `[{"ip": "<ip-address>", "reason": "<optional-reason>"}, ...]`, an array of objects
+
+### Authorization
+
+The request must contain an `Authorization` header with the value set to `Nostr <base64(auth-event)>` in which `<auth-event>` is an event of kind `27235` with a tag `["u", <url-of-the-relay-being-called>]` and a tag `["payload", <sha256-hash-of-the-request-body-as-lowercase-hex>]` and `created_at` set to the current timestamp.