-This file specifies which mirrors should be used for retreiving the Debian
-packages used for creating the main chroot (including all the software you would
-like to see included). If you want to use a local mirror you either have to
-adjust this file or use the GRML_LIVE_SOURCES variable inside
-/etc/grml/grml-live.conf which modifies /etc/grml/fai/apt/sources.list
-on-the-fly then.
+This file specifies which mirrors should be considered for retrieving the Debian
+packages when creating the main chroot (including all the software you would
+like to see included). Important: this file should *not* be adjusted manually!
+Instead use the GRML_LIVE_SOURCES variable inside /etc/grml/grml-live.conf which
+modifies /etc/grml/fai/apt/sources.list on-the-fly via grml-live then. If you
+want to generally adjust apt configuration check out /etc/grml/fai/files/etc/apt
+instead.