MADISON, Wis. — Health and Human Services Secretary Tommy Thompson paid a $3,000 fine for not telling state ethics officials about his investment in a condominium project when he was governor.

Thompson said he did not know that state law required him to report the investment on state financial disclosure forms.

"It is clear that a mistake was made, and I willingly and voluntarily accept the consequences for it," Thompson wrote in a letter to state Ethics Board Director Roth Judd. The fine was paid Monday.