diff --git a/test/py/control/beamlet_stream.py b/test/py/control/beamlet_stream.py
index 47ac6fbc83e2e7c5c8ae203cd2a9a786a77be385..a3f841f0f6342d9dce3411b9458899025e3c9975 100755
--- a/test/py/control/beamlet_stream.py
+++ b/test/py/control/beamlet_stream.py
@@ -171,6 +171,7 @@ class BeamletStream(object):
         self.stream_reader.start()
 
     def stop_stream_reader(self, timeout=60):
+        """ Stop stream reader """
         if self.stream_reader:
             # print_result("stop_stream_reader", True)
             # Wait until SDPFW has stopped stream output