=== modified file 'source/chapters/djing_with_mixxx.rst'
--- source/chapters/djing_with_mixxx.rst	2012-06-10 15:40:18 +0000
+++ source/chapters/djing_with_mixxx.rst	2012-12-15 10:53:49 +0000
@@ -84,6 +84,15 @@
 | artist:Danger rating:>=4                                                         |
 +------------------------------------------+---------------------------------------+
 
+Previewing Tracks
+=================
+
+To prelisten to a track activate the 'Preview' column in a library view
+and then click on the play Icon. The track will then start playing in a
+special preview deck that will only output sound in the headphones channel.
+clicking the button again will stop the playback. Some skins support the
+preview deck (show/hide with CTRL+P) to manual search in the track.
+
 Waveform displays
 =================
 

=== modified file 'source/chapters/library.rst'
--- source/chapters/library.rst	2012-10-28 16:52:58 +0000
+++ source/chapters/library.rst	2012-12-15 10:57:23 +0000
@@ -45,6 +45,21 @@
 might have (such as hot cues and the BPM) will not be lost if the file is
 replaced.
 
+Hidden Tracks
+=============
+
+The Hidden Tracks view is accessible by expanding Library tree item in the
+sidebar. Tracks can be hidden from the complete Library including playlists
+and crates by the context menu in any view. Once they are hidden they will
+appear in the Hidden Tracks view and con be deleted or restored from there.
+
+Deleting Tracks
+===============
+
+Tracks that appear in the Missing Tracks or Hidden Tracks view can be
+deleted from the context menu there. 'Warning' This will delete all
+metadata Mixxx has for a track.
+
 Auto DJ
 =======