LinuxQuestions.org - [SOLVED] How to add a directory to PATH?

I carefully followed instructions on how to add a directory to PATH, but it's not working.
I export PATH from .bash_profile in my home directory, but when I rebooted, nothing was added to PATH.

Code:

~$ pwd

/home/wolf

~$ echo $SHELL

/bin/bash

~$ more .bash_profile

export PATH=$PATH:/home/wolf/.gem/ruby/1.8/bin

~/rspec/hello/spec$ printenv PATH

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

When I add the same directory from the terminal, it works (until the session ends):

Code:

~$ export PATH=$PATH:/home/wolf/.gem/ruby/1.8/bin

~$ printenv PATH

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/wolf/.gem/ruby/1.8/bin

How to have a directory in PATH every time I boot?
I am running Ubuntu 10.4

Thank you