Index: sound.h
===================================================================
--- sound.h	(revision 63)
+++ sound.h	(revision 64)
@@ -235,8 +235,16 @@
 Internal use.
 **/
 
-// Example
+extern void raydium_sound_source_fade(int src, ALfloat len);
 /**
+This function will fade down source ##src## over ##len## seconds.
+Since gain is not linear, you may have to play with ##len## to
+find the correct value.
+Use source 0 for music source.
+**/
+
+// Sound API Example
+/**
 %%(c)
 int sound;
 sound=raydium_sound_LoadWav("explo.wav");