This should work in Atlas, at least

ben · ben · commit 4ec71e30665c · 2014-06-01T19:32:38.000-07:00
diff --git a/en/book/book.asc b/en/book/book.asc
@@ -5,7 +5,7 @@ Pro Git
 :toc:
 :toclevels: 2
 
-[preface]
+[preface,au="Scott Chacon"]
 == Introduction
 
 Welcome to the second edition of Pro Git.
