Updating metadata for 11 gems

I justed typed “gem outdated” and got the following output in my
terminal:

Updating metadata for 11 gems from http://gems.rubyforge.org

complete

My first thought was that there are some gems neeeded to be updated -
so I
typed it again and got the following:

bullet:~ root# gem outdated
bullet:~ root#

So there are no updates available.
What exactly does “Updating metadata for 11 gems…” mean?

Thanx

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