Im unsure on how to answer the question on form 8379 "why did I sign the joint filing?" My spouses debt was before our relationship/marriage what do I say?

My wife had debt before we met and this is the first year doing our taxes online so we're unsure on how to respond to this question. We filed our taxes married filing jointly with the injured spouse and I signed them but I don't know what they are exactly looking for as far as an answer/response would go.