diff --git a/whisper-2023/hotwords.py b/whisper-2023/hotwords.py
index 8792cd3..590e05f 100644
--- a/whisper-2023/hotwords.py
+++ b/whisper-2023/hotwords.py
@@ -24,6 +24,20 @@ def main():
 def log(*args):
    print(">", *args, file=sys.stderr)
 
+class Piper(threading.Thread):
+   def __init__(self, inq, outq):
+      threading.Thread.__init__(self)
+      self.inq = inq
+      self.outq = outq
+
+   def run(self):
+      while True:
+         got = self.inq.get()
+         if got is None:
+            break
+         self._run(got)
+      self.outq.put(None)
+
 class Manager(threading.Thread):
    def __init__(self, outq):
       threading.Thread.__init__(self)