A few words about stem export, and a screenshot for good measure.

_manual/18_exporting/01_export-dialog.html

@@ -68,6 +68,15 @@ enabled - this will export the whole session from the start marker to the end ma
 Here you can choose which outputs (tracks or busses) should be sent to the exported file.
 </p>
 
+<h2>Stem Export</h2>
+<img src="/ardour/manual/html/screenshots/export-dialog-stem-export.png" />
+<p>
+If you chose 'Stem Export', the 'Channels' tab appears slightly differently:
+in this case each chosen channel (track or bus) is exported to its own file,
+instead of all channels being mixed together into a single file. You can
+choose to export either the region contents or the track output here in this
+case.
+</p>
 
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