diff --git a/doc/api/async_hooks.md b/doc/api/async_hooks.md
index 82327e9dd29832..5932d6fda3a65f 100644
--- a/doc/api/async_hooks.md
+++ b/doc/api/async_hooks.md
@@ -820,6 +820,7 @@ class WorkerPool extends EventEmitter {
     });
     this.workers.push(worker);
     this.freeWorkers.push(worker);
+    this.emit(kWorkerFreedEvent);
   }
 
   runTask(task, callback) {