diff --git a/py/serialserver.py b/py/serialserver.py
index 0041dbe523d5338b69beeec9e58fa500c7945d9d..30fa79d1598b9b18c38a8a3ee3f6b04ab6ac539d 100755
--- a/py/serialserver.py
+++ b/py/serialserver.py
@@ -33,8 +33,14 @@ async def receive(websocket,path):
       msg = await websocket.recv()
       address = websocket.remote_address[0]
       if (address != client):
+         #
+         # reject client
+         #
          print("connection rejected from "+address)
          continue
+      #
+      # accept client
+      #
       print("connection accepted from "+address)
       vars = json.loads(msg)
       if (vars['type'] == 'open'):
@@ -64,6 +70,9 @@ async def receive(websocket,path):
             print(err)
             await websocket.send(str(err))
       elif (vars['type'] == 'command'):
+         #
+         # send command
+         #
          print('send command')
          data = vars['contents']
          n = 0
@@ -81,6 +90,9 @@ async def receive(websocket,path):
             percent = (100.0*n)/len(data)
             await websocket.send(str(percent))
       elif (vars['type'] == 'file'):
+         #
+         # send file
+         #
          print('send file')
          data = vars['contents']
          n = 0