diff --git a/DOCS/xml/en/encoding-guide.xml b/DOCS/xml/en/encoding-guide.xml
index 6c418a6d05..b54c401171 100644
--- a/DOCS/xml/en/encoding-guide.xml
+++ b/DOCS/xml/en/encoding-guide.xml
@@ -1288,6 +1288,48 @@ Note the and options.
+
+Notes on Audio/Video synchronization
+
+MEncoder's audio/video synchronization
+algorithms were designed with the intention of recovering files with
+broken sync.
+However they seem to cause unnecessary skipping and duplication of
+frames, and possibly slight A/V desync, when used with proper input.
+It is therefore recommended that you switch to basic A/V sync with
+the option, or put this in your
+~/.mplayer/mencoder config file, as long as
+you are only working with good sources (DVD, TV capture, high quality
+MPEG-4 rips, etc) and not broken ASF/RM/MOV files.
+
+
+If you want to further guard against strange frame skips and
+duplication, you can use both and
+.
+This will prevent all A/V sync, and copy frames
+one-to-one, so you cannot use it if you will be using any filters that
+unpredictably add or drop frames, or if your input file has variable
+framerate!
+Therefore, using is not in general recommended.
+
+
+The so-called "three-pass" encoding which MEncoder
+supports has been reported to cause A/V desync.
+This will definitely happen if it is used in conjunction with certain
+filters, therefore, it is now recommended not to
+use three-pass mode.
+This feature is only left for compatibility purposes and for expert
+users who understand when it is safe to use and when it is not.
+If you have never heard of three-pass mode before, forget that we
+even mentioned it!
+
+
+There have also been reports of A/V desync when encoding from stdin
+with MEncoder.
+Do not do this! Always use a file or CD/DVD/etc device as input.
+
+
+
Audio