Download patch
ref: 8de11f3def20c1e265ab0c60b7a4e81fa011ccf7 parent: f92fa39341846b694864fb5e94da442c6f3fbb6e author: Werner Lemberg <wl@gnu.org> date: Wed Feb 20 11:18:40 EST 2019
s/NULL/`NULL`/ in documentation.