diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee02454d..b13636f7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
-# v1.8.6-alpha0
+# v1.8.6-alpha1
 
 * Read `type_count(..)` from cache if available, pr #443.
+* Add `scope` in format `@collection:...` to room events, pr #444.
 
 # v1.8.5
 
diff --git a/inc/ti/collection.t.h b/inc/ti/collection.t.h
index 11e78147..f20a9852 100644
--- a/inc/ti/collection.t.h
+++ b/inc/ti/collection.t.h
@@ -28,6 +28,7 @@ struct ti_collection_s
     uint64_t created_at;    /* UNIX time-stamp in seconds */
     ti_tz_t * tz;
     ti_raw_t * name;
+    ti_raw_t * scope;
     imap_t * things;        /* weak map for ti_thing_t */
     imap_t * rooms;         /* weak map for ti_room_t */
     queue_t * gc;           /* ti_gc_t */
diff --git a/inc/ti/version.h b/inc/ti/version.h
index 13d4b7af..b43362d3 100644
--- a/inc/ti/version.h
+++ b/inc/ti/version.h
@@ -25,7 +25,7 @@
  *  "-rc0"
  *  ""
  */
-#define TI_VERSION_PRE_RELEASE "-alpha0"
+#define TI_VERSION_PRE_RELEASE "-alpha1"
 
 #define TI_MAINTAINER \
     "Jeroen van der Heijden <jeroen@cesbit.com>"
diff --git a/itest/requirements.txt b/itest/requirements.txt
index 74182d78..e0f7a154 100644
--- a/itest/requirements.txt
+++ b/itest/requirements.txt
@@ -1,7 +1,7 @@
 psutil
 pycodestyle
 msgpack
-python-thingsdb>=1.3.0
+python-thingsdb>=1.4.0
 requests
 pytz
 websockets
diff --git a/itest/test_room.py b/itest/test_room.py
index 27a40e87..8b8a696a 100755
--- a/itest/test_room.py
+++ b/itest/test_room.py
@@ -336,6 +336,38 @@ async def test_room_peer_only(self, cl0, cl1, cl2):
             'from_0_to_peers',
         ]), sorted(actions1))
 
+    async def test_multi_collection_room(self, cl0, cl1, cl2):
+        await cl0.query(r"""//ti
+            new_collection('a');
+            new_collection('b');
+        """, scope='/t')
+        room_id_a = await cl0.query(r"""//ti
+            .room = room();
+            .room.id();
+        """, scope='//a')
+        room_id_b = await cl0.query(r"""//ti
+            .room = room();
+            .room.id();
+        """, scope='//b')
+
+        self.assertEqual(room_id_a, room_id_b)
+
+        actions0 = []
+        actions1 = []
+        room0 = ORoom(actions0, room_id_a, scope='//a')
+        room1 = ORoom(actions1, room_id_b, scope='//b')
+
+        await room0.join(cl0)
+        await room1.join(cl0)
+
+        await room0.emit('add', 'room0')
+        await room1.emit('add', 'room1')
+
+        await asyncio.sleep(1.5)
+
+        self.assertEqual(['room0'], actions0)
+        self.assertEqual(['room1'], actions1)
+
 
 if __name__ == '__main__':
     run_test(TestRoom())
diff --git a/src/ti/collection.c b/src/ti/collection.c
index 7e929b67..f3ae537f 100644
--- a/src/ti/collection.c
+++ b/src/ti/collection.c
@@ -56,6 +56,7 @@ ti_collection_t * ti_collection_create(
     collection->id = collection_id;
     collection->next_free_id = next_free_id;
     collection->name = ti_str_create(name, n);
+    collection->scope = ti_str_from_fmt("@collection:%.*s", (int) n, name);
     collection->things = imap_create();
     collection->rooms = imap_create();
     collection->gc = queue_new(20);
@@ -77,7 +78,7 @@ ti_collection_t * ti_collection_create(
     if (!collection->name || !collection->things || !collection->gc ||
         !collection->access || !collection->procedures || !collection->lock ||
         !collection->types || !collection->enums || !collection->futures ||
-        !collection->rooms || !collection->named_rooms ||
+        !collection->rooms || !collection->named_rooms || !collection->scope ||
         !collection->ano_types || uv_mutex_init(collection->lock))
     {
         ti_collection_drop(collection);
@@ -100,6 +101,7 @@ void ti_collection_destroy(ti_collection_t * collection)
     imap_destroy(collection->rooms, NULL);
     queue_destroy(collection->gc, NULL);
     ti_val_drop((ti_val_t *) collection->name);
+    ti_val_drop((ti_val_t *) collection->scope);
     vec_destroy(collection->access, (vec_destroy_cb) ti_auth_destroy);
     vec_destroy(collection->vtasks, (vec_destroy_cb) ti_vtask_drop);
     vec_destroy(collection->commits, (vec_destroy_cb) ti_commit_destroy);
diff --git a/src/ti/room.c b/src/ti/room.c
index c544b574..6f8867f1 100644
--- a/src/ti/room.c
+++ b/src/ti/room.c
@@ -114,7 +114,7 @@ static void room__emit_delete(ti_room_t * room)
         msgpack_sbuffer buffer;
         ti_pkg_t * pkg;
 
-        if (mp_sbuffer_alloc_init(&buffer, 32, sizeof(ti_pkg_t)))
+        if (mp_sbuffer_alloc_init(&buffer, 320, sizeof(ti_pkg_t)))
         {
             log_critical(EX_MEMORY_S);
             return;
@@ -122,7 +122,13 @@ static void room__emit_delete(ti_room_t * room)
 
         msgpack_packer_init(&pk, &buffer, msgpack_sbuffer_write);
 
-        msgpack_pack_map(&pk, 1);
+        msgpack_pack_map(&pk, 2);
+
+        mp_pack_str(&pk, "scope");
+        mp_pack_strn(&pk,
+                     room->collection->scope->data,
+                     room->collection->scope->n);
+
         mp_pack_str(&pk, "id");
         msgpack_pack_uint64(&pk, room->id);
 
@@ -189,7 +195,12 @@ int ti_room_emit(
 
     sz = buffer.size;
 
-    msgpack_pack_map(&vp.pk, 3);
+    msgpack_pack_map(&vp.pk, 4);
+
+    mp_pack_str(&vp.pk, "scope");
+    mp_pack_strn(&vp.pk,
+                 room->collection->scope->data,
+                 room->collection->scope->n);
 
     mp_pack_str(&vp.pk, "id");
     msgpack_pack_uint64(&vp.pk, room->id);
@@ -403,6 +414,7 @@ void ti_room_emit_node_status(ti_room_t * room, const char * status)
 typedef struct
 {
     uint64_t room_id;
+    char scope[268];
     ti_stream_t * stream;
 } room__async_t;
 
@@ -419,7 +431,7 @@ static void room__async_emit_join_cb(uv_async_t * task)
     if (ti_stream_is_closed(w->stream))
         goto done;
 
-    if (mp_sbuffer_alloc_init(&buffer, 32, sizeof(ti_pkg_t)))
+    if (mp_sbuffer_alloc_init(&buffer, 320, sizeof(ti_pkg_t)))
     {
         log_critical(EX_MEMORY_S);
         goto done;
@@ -427,13 +439,13 @@ static void room__async_emit_join_cb(uv_async_t * task)
 
     msgpack_packer_init(&pk, &buffer, msgpack_sbuffer_write);
 
-    if (msgpack_pack_map(&pk, 1) ||
-        mp_pack_str(&pk, "id") ||
-        msgpack_pack_uint64(&pk, w->room_id))
-    {
-        log_critical(EX_MEMORY_S);
-        goto done;
-    }
+    msgpack_pack_map(&pk, 2);
+
+    mp_pack_str(&pk, "scope");
+    mp_pack_str(&pk, w->scope);
+
+    mp_pack_str(&pk, "id");
+    msgpack_pack_uint64(&pk, w->room_id);
 
     pkg = (ti_pkg_t *) buffer.data;
     pkg_init(pkg, TI_PROTO_EV_ID, TI_PROTO_CLIENT_ROOM_JOIN, buffer.size);
@@ -451,12 +463,16 @@ static void room__async_emit_join(ti_room_t * room, ti_stream_t * stream)
 {
     uv_async_t * task = malloc(sizeof(uv_async_t));
     room__async_t * w = malloc(sizeof(room__async_t));
+    ti_raw_t * scope = room ->collection->scope;
 
     if (!task || !w)
         goto failed;
 
     w->stream = stream;
     w->room_id = room->id;
+    memcpy(w->scope, scope->data, scope->n);
+    w->scope[scope->n] = '\0';
+
     task->data = w;
 
     if (uv_async_init(ti.loop, task, (uv_async_cb) room__async_emit_join_cb) ||
@@ -485,7 +501,7 @@ static void room__emit_leave(ti_room_t * room, ti_stream_t * stream)
     if (ti_stream_is_closed(stream))
         return;
 
-    if (mp_sbuffer_alloc_init(&buffer, 32, sizeof(ti_pkg_t)))
+    if (mp_sbuffer_alloc_init(&buffer, 320, sizeof(ti_pkg_t)))
     {
         log_critical(EX_MEMORY_S);
         return;
@@ -493,13 +509,15 @@ static void room__emit_leave(ti_room_t * room, ti_stream_t * stream)
 
     msgpack_packer_init(&pk, &buffer, msgpack_sbuffer_write);
 
-    if (msgpack_pack_map(&pk, 1) ||
-        mp_pack_str(&pk, "id") ||
-        msgpack_pack_uint64(&pk, room->id))
-    {
-        log_critical(EX_MEMORY_S);
-        return;
-    }
+    msgpack_pack_map(&pk, 2);
+
+    mp_pack_str(&pk, "scope");
+    mp_pack_strn(&pk,
+                room->collection->scope->data,
+                room->collection->scope->n);
+
+    mp_pack_str(&pk, "id");
+    msgpack_pack_uint64(&pk, room->id);
 
     pkg = (ti_pkg_t *) buffer.data;
     pkg_init(pkg, TI_PROTO_EV_ID, TI_PROTO_CLIENT_ROOM_LEAVE, buffer.size);