diff --git a/lib/workerpool.py b/lib/workerpool.py
index b7c4d0a77beeb0f677e514644fcda05a5dc5ac9c..aac3e3769a15b627c9ed907f21ebcc13fd8ea252 100644
--- a/lib/workerpool.py
+++ b/lib/workerpool.py
@@ -288,6 +288,7 @@ class WorkerPool(object):
       self._lock.release()
       try:
         for worker in termworkers:
+          logging.debug("Waiting for thread %s", worker.getName())
           worker.join()
       finally:
         self._lock.acquire()