[LBo] section 3.3.3.2. Which

[Ray]

Hello,
quick question about the command "which" in section 3.3.3.2

according to the course book, "which -a ls"  should provide output similar to 
the following. (especially the part about indicating the aliases)

gerrit:~> which -a ls
ls is aliased to `ls -F --color=auto'
ls is /bin/ls

using kubuntu edgy I get the following:

ray at dev:~$ which -a ls
/bin/ls

the output of a "ls" command looks like the color option is applied, but not 
the -F option.
Shell is BASH

[ray at dev:~$ echo $SHELL
/bin/bash]h

can anybody explain what is going on?
Thanks
Ray