diff --git a/lib/client/websocket-tracker.js b/lib/client/websocket-tracker.js
index 3d0a63b..aab6424 100644
--- a/lib/client/websocket-tracker.js
+++ b/lib/client/websocket-tracker.js
@@ -247,6 +247,7 @@ WebSocketTracker.prototype._onAnnounceResponse = function (data) {
     peer.id = common.binaryToHex(data.peer_id)
     peer.once('signal', function (answer) {
       var params = {
+        action: 'announce',
         info_hash: self.client._infoHashBinary,
         peer_id: self.client._peerIdBinary,
         to_peer_id: data.peer_id,
diff --git a/server.js b/server.js
index 11c8acb..3bf01e1 100644
--- a/server.js
+++ b/server.js
@@ -369,6 +369,7 @@ Server.prototype._onWebSocketRequest = function (socket, opts, params) {
       debug('got %s peers from swarm %s', peers.length, params.info_hash)
       peers.forEach(function (peer, i) {
         peer.socket.send(JSON.stringify({
+          action: 'announce',
           offer: params.offers[i].offer,
           offer_id: params.offers[i].offer_id,
           peer_id: common.hexToBinary(params.peer_id),
@@ -392,6 +393,7 @@ Server.prototype._onWebSocketRequest = function (socket, opts, params) {
         }
 
         toPeer.socket.send(JSON.stringify({
+          action: 'announce',
           answer: params.answer,
           offer_id: params.offer_id,
           peer_id: common.hexToBinary(params.peer_id),