diff --git a/alsa.md b/alsa.md
index 4cfa8f3..337f7e8 100644
--- a/alsa.md
+++ b/alsa.md
@@ -17,8 +17,11 @@ Variable | Meaning | Type | Default
 `header` | Text to show before value | string | " Vol "
 `header_color` | Header color | string | `beautiful.fg_normal` or "#FFFFFF"
 `color` | Value color | string | `beautiful.fg_focus` or "#FFFFFF"
+`footer` | Text to append after value | string | ""
 
-and outputs the following table:
+*Note*: `footer` can be markup text.
+
+`lain.widgets.alsa` outputs the following table:
 
 Variable | Meaning | Type
 --- | --- | ---