diff --git a/gpiozero/pins/data.py b/gpiozero/pins/data.py
index 343f001..af933ea 100644
--- a/gpiozero/pins/data.py
+++ b/gpiozero/pins/data.py
@@ -538,7 +538,7 @@ def _parse_pi_revision(revision):
             8: '3B',
             9: 'Zero',
             10: 'CM3',
-            12: 'Zero W,
+            12: 'Zero W',
             }[(revision & 0xff0) >> 4]
         if model in ('A', 'B'):
             pcb_revision = {