diff --git a/dmx.py b/dmx.py
index 23130e3..984ad19 100644
--- a/dmx.py
+++ b/dmx.py
@@ -94,7 +94,7 @@ class RotatingRainbow:
         return rgb
 
     def __str__(self):
-        return "{type(self).__name__}"
+        return f"{type(self).__name__}"
 
 
 class Chase(Steady):
diff --git a/foobaz.py b/foobaz.py
index f7cd36c..ebdc450 100644
--- a/foobaz.py
+++ b/foobaz.py
@@ -34,12 +34,13 @@ def update(state):
     dmx.start()
     return {'result': 'ok'}
 
+
 def main(args):
     global dmx
 
     parser = argparse.ArgumentParser(prog='foobazdmx', description='Make the lights flicker.')
     parser.add_argument('-a', '--artnet', type=str, required=True, help="Art-Net server")
-    parser.add_argument('-r', '--room', type=str, required=True, help="light setup for room")
+    parser.add_argument('-r', '--room', type=str, required=True, help="light setup for room: shop or big")
     args = parser.parse_args(args)
 
     artnet = args.artnet