--- a/debian-apt.rst	Sat May 21 10:41:58 2016 +0300
+++ b/debian-apt.rst	Sun May 22 13:25:10 2016 +0300
@@ -6,21 +6,78 @@
 .. contents::
    :local:
 
-Conf files.
-===========
+Debian releases
+===============
+
+Workflow::
+
+  experimental → unstable (sid) → testing → stable
+
+Which package from witch release::
+
+  $ aptitude search ~S~i~Astable
+  $ aptitude search ~S~i~Atesting
+  $ aptitude search ~S~i~Aunstable
+  $ aptitude search ~S~i~Aexperimental
+
+ * https://wiki.debian.org/DebianReleases
+ * https://wiki.debian.org/DebianOldStable
+ * https://wiki.debian.org/DebianStable
+ * https://wiki.debian.org/DebianTesting
+ * https://wiki.debian.org/DebianUnstable
+ * https://wiki.debian.org/DebianExperimental
+
+Conf files
+==========
 
 See man sources.list(5), apt.conf(5), apt_preferences(5).
 
-``/etc/apt/sources.list``::
+``http://httpredir.debian.org/debian/`` used for automatic balancing to nearest
+perository. Corresponding ``/etc/apt/sources.list`` may have::
+
+  deb http://httpredir.debian.org/debian/  stable  main contrib non-free
+  deb http://httpredir.debian.org/debian/  stable-backports  main contrib non-free
+  deb http://httpredir.debian.org/debian/  unstable  main contrib non-free
+  deb http://httpredir.debian.org/debian/  experimental  main contrib non-free
+  deb http://httpredir.debian.org/debian/  testing  main contrib non-free
+  deb http://httpredir.debian.org/debian/  testing  main contrib non-free
+
+Security updates destributed via different URL (for ``oldstable``, ``stable``
+and ``testing`` only, of cause there are no reason for ``sid`` or
+``experimental``)::
+
+  deb http://security.debian.org/  oldstable  main contrib non-free
+  deb http://security.debian.org/  stable  main contrib non-free
+  deb http://security.debian.org/  testing  main contrib non-free
+
+Other useful repositories::
+
+  deb http://www.deb-multimedia.org  testing  main non-free
 
-  deb http://ftp.debian.org.ua/debian/ stable main contrib non-free
-  deb http://ftp2.debian.org.ua/debian/ testing main contrib non-free
-  deb http://ftp2.debian.org.ua/debian/ unstable main contrib non-free
-  deb http://ftp.uk.debian.org/debian/ experimental main contrib non-free
-  deb http://www.deb-multimedia.org testing main non-free
+http://httpredir.debian.org/
+  The redirector aims to solve the problem of choosing a Debian mirror.
+https://www.debian.org/security/
+  Keeping your Debian system secure.
+
+Find nearest mirror
+===================
+
+Newer approach for selecting mirror is via DNS balancing from
+``httpredir.debian.org``. Just use::
 
-Package priority.
-=================
+  deb http://httpredir.debian.org/debian/  stable  main contrib non-free
+
+Older approach to select nearest mirrors is::
+
+  $ sudo apt-get install netselect-apt
+  $ netselect-apt stable
+  $ netselect-apt testing
+  $ netselect-apt unstable
+  $ netselect-apt experimental
+  $ netselect-apt sid
+
+Package priority
+================
 
 ``/etc/apt/preferences``::
 
@@ -87,27 +144,6 @@
   p   24.4+1-5                                      kali-current              50
   i   24.5+1-3                                      testing                   990
 
-Debian releases.
-================
-
-Workflow::
-
-  experimental → unstable (sid) → testing → stable
-
-Which package from witch release::
-
-  $ aptitude search ~S~i~Astable
-  $ aptitude search ~S~i~Atesting
-  $ aptitude search ~S~i~Aunstable
-  $ aptitude search ~S~i~Aexperimental
-
- * https://wiki.debian.org/DebianReleases
- * https://wiki.debian.org/DebianOldStable
- * https://wiki.debian.org/DebianStable
- * https://wiki.debian.org/DebianTesting
- * https://wiki.debian.org/DebianUnstable
- * https://wiki.debian.org/DebianExperimental
-
 Setup backport.
 ===============
 
@@ -230,21 +266,6 @@
 
   $ aptitude search '?tag(works-with::logfile)'
 
-Find nearest mirror.
-====================
-::
-
-  $ sudo apt-get install netselect-apt
-  $ netselect-apt stable
-  $ netselect-apt testing
-  $ netselect-apt unstable
-  $ netselect-apt experimental
-  $ netselect-apt sid
-
-Newer approach for selecting mirror is via DNS. Just use::
-
-  http://httpredir.debian.org/
-
 Show dependency graph.
 ======================
 ::