Add annotations

37.md

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+NIP-37
+======
+
+Annotations
+-----------
+
+`draft` `optional`
+
+This NIP adds a new concept called "annotations" which allow authors to create privileged comments on their own notes.
+These are simply `kind:1` replies with an additional `annotation` tag.
+
+These can be used to indicate updates, edits, corrections, or retractions, without obscuring the content of the original
+note or forcing clients to handle multiple versions of the note. These MAY be applied to events of any kind.
+
+```js
+{
+  "kind": 1,
+  "pubkey": "<pubkey>",
+  "tags": [
+    ["e", "<event_id>", "<relay_hint>", "reply"],
+    ["annotation"]
+  ],
+  "content": "EDIT: I forgot to say...",
+  // ...other fields
+}
+```
+
+Clients MUST check if the pubkey of the annotation is the same as the referenced event.
+
+These events are designed so that clients that don't support annotations will still show these events as replies.
+
+Clients SHOULD have a strategy for displaying replies to annotations.