PITTSBURGH (AP) — The U.S. Department of Energy said Friday that it welcomes the decision by oil and gas industry supplier Baker Hughes to disclose all chemicals in hydraulic fracturing fluid. But Halliburton, a major competitor in the field, isn’t committing to such disclosure.

Deputy Assistant Energy Secretary Paula Gant said that Baker Hughes’ move “is an important step in building public confidence” and the department “hopes others will follow their lead.”