Add documentation for dark-mode option

diff --git a/doc/vimb.1 b/doc/vimb.1
index d10ba32..9b1550a 100644 (file)
--- a/doc/vimb.1
+++ b/doc/vimb.1
@@ -1143,6 +1143,10 @@ selected.
 .B cursiv-font (string)
 The font family used as the default for content using cursive font.
 .TP
+.B dark-mode (bool)
+Whether to enable dark mode. Websites can use the `prefers-color-scheme' media
+query to adjust styles according to this option.
+.TP
 .B default-charset (string)
 The default text charset used when interpreting content with an unspecified
 charset.