running tidy on multiple files

Hi, sorry to bug you with a dumb question, but how do you run tidy on
multiple files? The documentation says it accepts wildcards but it doesn't
work:

tidy -m *.html

Error: Can't open "*.html"

thanks,
Scott

Scott Stark/Oakland/IBM@IBMUS
sstark@us.ibm.com
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Austin, TX 78722
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