Madison-based Singlewire Software announced a strategic investment from funds advised by the equity firm PSG, according to a joint release.

PSG, a growth equity firm partnering with middle-market software and technology-enabled service companies, will add three members to Singlewire’s board of directors as part of the deal.

Singlewire is a provider of essential mass notification software for safety, emergency, and workflow communications. The investment from PSG will allow Singlewire to innovate and expand offerings. The financial terms of the investment were not disclosed.