diff --git a/DOCS/documentation.html b/DOCS/documentation.html
index af1c7dc733..f69f739122 100644
--- a/DOCS/documentation.html
+++ b/DOCS/documentation.html
@@ -115,6 +115,10 @@
       <LI><A HREF="sound.html#2.3.2">2.3.2 Audio</A></LI>
       <UL>
 	<LI><A HREF="sound.html#2.3.2.1">2.3.2.1 Soundcard experiences, recommendations</A></LI>
+	<LI><A HREF="sound.html#2.3.2.2">2.3.2.2 Audio plugins</A></LI>
+	  <UL>
+	    <LI><A HREF="sound.html#2.3.2.2.1">2.3.2.2.1 Up/Downsampling</A></LI>
+	  </UL>
       </UL>
     </UL>
     <LI><A HREF="encoding.html#2.4">2.4 MEncoder - An Encoder based on MPlayer</A></LI>
diff --git a/DOCS/sound.html b/DOCS/sound.html
index ee487744d9..9347405cf5 100644
--- a/DOCS/sound.html
+++ b/DOCS/sound.html
@@ -123,5 +123,21 @@ problems (losing sync, disappearing audio, etc).</LI>
 <LI>Please tell us how MPlayer and your soundcard(s) worked together!
 </UL></P>
 
+
+<P><B><A NAME=2.3.2.2>2.3.2.2. Audio plugins</B></P>
+
+<P><B><A NAME=2.3.2.2.1>2.3.2.2.1. Up/Downsampling</B></P>
+
+<P><B>MPlayer</B> fully supports up/downsampling of audio stream.
+It is not autodetected, so you have to specify it explicitly even when
+for example you have a max 44.1Khz capable soundcard, and the audio
+is 48Khz. Also, this functionality is currently unimplemented in
+<B>MEncoder</B>.</P>
+
+<P>Usage :<BR>
+&nbsp;&nbsp;<CODE>mplayer media.avi -aop list=resample:fout=&lt;required
+  frequency in Hz, like 44100&gt;</CODE></P>
+
+
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