diff --git a/main.py b/main.py
index 3dbaa81..382c5aa 100755
--- a/main.py
+++ b/main.py
@@ -49,17 +49,35 @@ def main():
     parser.add_argument('--mqtt-port', type=int, default=1883)
     parser.add_argument('--mqtt-user')
     parser.add_argument('--mqtt-pass', '--mqtt-password')
-    parser.add_argument('--mqtt-topic', default='/voc/alert')
+    parser.add_argument(
+        '--mqtt-topic',
+        default='/voc/alert',
+        help='mqtt topic to listen on, default /voc/alert',
+    )
 
     # sACN
     sacn = parser.add_mutually_exclusive_group(required=True)
-    sacn.add_argument('--sacn-multicast', action='store_true')
-    sacn.add_argument('--sacn-target')
+    sacn.add_argument(
+        '--sacn-multicast', action='store_true', help='use sACN multicast'
+    )
+    sacn.add_argument('--sacn-target', help='send sACN unicast to specified address')
 
     # Lights
-    parser.add_argument('--ignition-wal-l710', nargs='+', type=int)
-    parser.add_argument('--varytec-wash-zoom-712', nargs='+', type=int)
-    parser.add_argument('--wled', nargs='+', type=int)
+    parser.add_argument(
+        '--ignition-wal-l710',
+        nargs='+',
+        type=int,
+        help='dmx start addresses of Ignition WAL-L710',
+    )
+    parser.add_argument(
+        '--varytec-wash-zoom-712',
+        nargs='+',
+        type=int,
+        help='dmx start addresses of Varytec Hero Wash 712 Z',
+    )
+    parser.add_argument(
+        '--wled', nargs='+', type=int, help='dmx start addresses of WLED receivers'
+    )
 
     args = parser.parse_args()