designed to support any number of active sources and a variety of source
media. The files list one source per line (one line style) or contain multiline
stanzas defining one or more sources per stanza (deb822 style), with the
- most preferred source listed first. The information available from the
+ most preferred source listed first (in case a single version is available from more than one source). The information available from the
configured sources is acquired by <command>apt-get update</command> (or
by an equivalent command from another APT front-end).
</para>