The WS220 release of WormBase contains release 2 of the Male Wiring Project (MWP), at the Albert Einstein College of Medicine. This data consists of neural connections found in the adult male tail. It adds 8,400 pair-wise connections to WormBase , taking the total to 22,500 connections. All neural connection data in WormBase can be accessed using NeuroBrowse, an interactive graphical tool. A link to NeuroBrowse is on the relevant anatomy pages or it can also be directly launched. A brief user guide for NeuroBrowse is on our wiki. We thank MWP for sharing data with WormBase. Please visit the MWP web site for updates and additional information.