re: apt-get doesn't like line 13 in /apt/sources.list

"Malformed" line 13

It is:    deb file://sources/x11

What is wrong?  What do I need to get apt-get update to work

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- Re: apt-get doesn't like line 13 in /apt/sources.list
  - From: "Kevin C. Smith" <smithkevinc@nettaxi.com>
- Re: apt-get doesn't like line 13 in /apt/sources.list
  - From: "Tibor D." <linux_ch@scientist.com>
- re: apt-get doesn't like line 13 in /apt/sources.list
  - From: Nicolas Bertolissio <nico.bertol@wanadoo.fr>