diff --git a/FEDERATION.md b/FEDERATION.md
index 935940a..a07e007 100644
--- a/FEDERATION.md
+++ b/FEDERATION.md
@@ -977,6 +977,31 @@ look like this:
 }
 ```
 
+The Accept activity can be sent automatically by the Project actor, or manually
+by a Person in the project team. It has `object` set to the URI of the Offer,
+and `result` set to the URI of the newly created Ticket.
+
+```json
+{
+    "summary": "<p>fr33's ticket accepted by project ./s/fr33/p/sandbox: This ticket is open</p>",
+    "@context": [
+        "https://www.w3.org/ns/activitystreams",
+        "https://forgefed.peers.community/ns",
+        "https://angeley.es/as2-ext"
+    ],
+    "to": [
+        "https://forge.angeley.es/s/fr33",
+        "https://forge.angeley.es/s/fr33/p/sandbox/team",
+        "https://forge.angeley.es/s/fr33/p/sandbox/followers"
+    ],
+    "actor": "https://forge.angeley.es/s/fr33/p/sandbox",
+    "result": "https://forge.angeley.es/s/fr33/p/sandbox/t/6",
+    "object": "https://forge.angeley.es/s/fr33/outbox/wl5Yl",
+    "id": "https://forge.angeley.es/s/fr33/p/sandbox/outbox/r07JE",
+    "type": "Accept"
+}
+```
+
 TODO turn replies and history into URIS pointing to separate Collections
 
 TODO replies and depends (ForgeFed #12)