diff --git a/homeassistant/components/html5/notify.py b/homeassistant/components/html5/notify.py
index 48cc0598479..e9ebdb9da67 100644
--- a/homeassistant/components/html5/notify.py
+++ b/homeassistant/components/html5/notify.py
@@ -154,6 +154,7 @@ HTML5_SHOWNOTIFICATION_PARAMETERS = (
     "tag",
     "timestamp",
     "vibrate",
+    "silent",
 )