diff --git a/libraries/libcanberra/README b/libraries/libcanberra/README
index cfc63bf85f..c86e8431d5 100644
--- a/libraries/libcanberra/README
+++ b/libraries/libcanberra/README
@@ -2,3 +2,6 @@ libcanberra is an implementation of the XDG Sound Theme and Name
 Specifications, for generating event sounds on free desktops. 
 It comes with several backends (ALSA, PulseAudio, OSS, GStreamer, null) 
 and is designed to be portable.
+
+This requires sound-theme-freedesktop.
+