diff --git a/crates/call-parameters/src/lib.rs b/crates/call-parameters/src/lib.rs
index 66fbe79..88a5591 100644
--- a/crates/call-parameters/src/lib.rs
+++ b/crates/call-parameters/src/lib.rs
@@ -94,9 +94,12 @@ pub struct CallParameters {
     /// Id of the service creator.
     pub service_creator_peer_id: String,
 
-    /// PeerId of the peer who hosts this service.
+    /// PeerId of the peer who hosts worker with this service.
     pub host_id: String,
 
+    /// PeerId of the worker who hosts this service.
+    pub worker_id: String,
+
     /// Id of the particle which execution resulted a call this service.
     pub particle_id: String,