[Rails] gem install bundler works, gem bundle doesn't?

This is probably a simple user error, but why doesn't "gem bundle" work
after "gem install bundler"?
=====
bash$ gem install bundler
Successfully installed bundler-0.9.26
1 gem installed
Installing ri documentation for bundler-0.9.26...
Installing RDoc documentation for bundler-0.9.26...

bash$ gem bundle
ERROR: While executing gem ... (RuntimeError)
Unknown command bundle
=====
Is there something I need to do to get gem to recognize the new 'bundle'
command?
My environment:
=====
bash$ rake about
About your application's environment
Ruby version 1.9.2 (x86_64-darwin10.4.0)
RubyGems version 1.3.7
Rack version 1.2
Rails version 3.0.0.rc
Active Record version 3.0.0.rc
Action Pack version 3.0.0.rc
Active Resource version 3.0.0.rc
Action Mailer version 3.0.0.rc
Active Support version 3.0.0.rc
Environment development
=====
TIA,

- ff
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