NEW YORK (AP) — Subway says it’s in the process of removing a chemical from its bread as part of an ongoing effort to improve its recipes.

The announcement comes after a popular food blogger launched a petition this week asking the sandwich chain to stop using the ingredient, called azodicarbonamide. A representative for Subway says the change was underway before the petition was launched, but did not immediately provide details on when it started or when it would be complete.