How can Time Machine be configured to backup external drives?

I was running out of space on my Mac internal hard drive.  I bought an external drive and moved all of the iTunes data to the external.  It freed up 100 MB on my internal drive.  However, Time Machine isn't backing up the data that I moved to the external drive. 
I still want to back up that data.  How do I configure Time Machine to backup both my internal Mac drive as well as the external drive, which is seperate from my backup drive?
Thanks.

External drives are automatically added to the list of items excluded from Time Machine backups. To remove the exclusion, open the Time Machine preference pane, click the lock icon to unlock it if necessary, and then click Options.

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