[OCLUG-Tech] What does the "+" signify in ls -l output?

[Brett Delmage <Brett [ at ] twobikes [ dot ] ottawa [ dot ] on [ dot ] ca>]

I've completely forgotten the meaning of the "+" in ls output  e.g.

-rw-r-----+ 1 brett www-data 88565 Jan  3 23:45 131230-233137-1.jpg
-rw-r-----  1 brett www-data 25007 Jan  7 14:00 logo.jpg

and nothing I've RTFM'd or googled seems to show its meaning.
Anyone?

And what would I man to get an explanation of ls format if I was a 
newbie?

Brett