Resetting "Maint Required" Light as Common Courtesy

I'm in full agreement with ya, although it takes less time to reset it yourself than it took to write the post.

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Luckily, my local dealers print on the work order to remember to reset the Maint Reqd light whenever they do an oil change.

However, if you change the oil yourself, or have a local mechanic do it, or your local dealer forgets, the instructions are available:

Page 122-123 of the US 2004 Prius Owner's Manual (Section 2-5 "Operation of Instruments and Controls: Gauges, Meters and Service Reminder Indicators", item (j) in the "Service reminder indicators and warning buzzers" section.