diff --git a/lib/nexrad/radar.py b/lib/nexrad/radar.py
index 758eedb..aa8e93c 100644
--- a/lib/nexrad/radar.py
+++ b/lib/nexrad/radar.py
@@ -41,7 +41,10 @@ def parse(text: str):
 RADAR_RANGE = 230000
 
 class Radar():
-    __slots__ = 'wban', 'call', 'name', 'coord', 'site_elevation', 'tower_height',
+    __slots__ = (
+        'wban', 'call', 'name', 'coord',
+        'site_elevation', 'tower_height',
+    )
 
     wban:           int
     call:           str