diff --git a/temporal/api/workflowservice/v1/request_response.proto b/temporal/api/workflowservice/v1/request_response.proto
index 90932afe..1e5ce9a4 100644
--- a/temporal/api/workflowservice/v1/request_response.proto
+++ b/temporal/api/workflowservice/v1/request_response.proto
@@ -452,11 +452,13 @@ message PollActivityTaskQueueRequest {
 message PollActivityTaskQueueResponse {
     // A unique identifier for this task
     bytes task_token = 1;
-    // The namespace the workflow which requested this activity lives in
+    // The namespace of the activity. If this is a workflow activity then this is the namespace of
+    // the workflow also. If this is a standalone activity then the name of this field is
+    // misleading, but retained for compatibility with workflow activities.
     string workflow_namespace = 2;
-    // Type of the requesting workflow
+    // Type of the requesting workflow (if this is a workflow activity).
     temporal.api.common.v1.WorkflowType workflow_type = 3;
-    // Execution info of the requesting workflow
+    // Execution info of the requesting workflow (if this is a workflow activity)
     temporal.api.common.v1.WorkflowExecution workflow_execution = 4;
     temporal.api.common.v1.ActivityType activity_type = 5;
     // The autogenerated or user specified identifier of this activity. Can be used to complete the