diff --git a/workers.aqua b/workers.aqua
index 84b66d1..df6a34d 100644
--- a/workers.aqua
+++ b/workers.aqua
@@ -10,6 +10,10 @@ service DealWorker("worker"):
     -- Throws an error if worker doesn't exist.
     get_peer_id(deal_id: ?string) -> PeerId
 
+    -- Returns worker peer id associated with `deal_id`.
+    -- Returns nil if worker doesn't exist.
+    get_peer_id_opt(deal_id: ?string) -> PeerId
+
     -- Removes worker with all deployed spells and services.
     -- Throws an error if worker doesn't exist.
     -- Worker can be removed only by worker creator or worker itself.
@@ -24,8 +28,13 @@ service Worker("worker"):
 
     -- Returns worker peer id associated with `init_peer_id`.
     -- Throws an error if worker doesn't exist.
+    -- WILL BE DEPRECATED SOON, use `get_worker_id` instead.
     get_peer_id() -> PeerId
 
+    -- Returns worker peer id associated with `init_peer_id`.
+    -- Returns nil if worker doesn't exist.
+    get_worker_id() -> ?PeerId
+
     -- Removes worker with all deployed spells and services.
     -- Throws an error if worker doesn't exist.
     -- Worker can be removed only by worker creator or worker itself.