diff --git a/common/options.description b/common/options.description
index 0a53c756c94..bd725fd7dfa 100644
--- a/common/options.description
+++ b/common/options.description
@@ -26,6 +26,7 @@ desc_option_imagemagick="Enable support for ImageMagick"
 desc_option_jack="Enable support for the JACK sound server"
 desc_option_jpeg="Enable support for JPEG images"
 desc_option_lame="Enable support for the LAME encoder"
+desc_option_libao="Enable support for libao sound library"
 desc_option_libedit="Enable support for NetBSD's libedit"
 desc_option_lua="Enable support for Lua"
 desc_option_lzo="Enable support for LZO compression format"