Daemonnews: "NetBSD 1.5.1 was released in late June 2001 after an extended period that was used for testing, enhancing the system, and of course bugfixing. NetBSD 1.5.1 is
the first maintenance release of the NetBSD 1.5 branch, and as such it includes few new features, and mostly improvements over the NetBSD 1.5 release. Binary
compatibility with 1.5 is retained, so a full or partial upgrade from 1.5 to 1.5.1 is not a problem."
July 2, 2001