diff --git a/preface.asciidoc b/preface.asciidoc
index 4fdca6ba..07e640c0 100644
--- a/preface.asciidoc
+++ b/preface.asciidoc
@@ -177,6 +177,8 @@ Many contributors offered comments, corrections, and additions to the early-rele
 * JerJohn15
 * Joe Bauers (joebauers)
 * joflynn
+* Johnson Lau (jl2012)
+* Jonathan Cross (jonathancross)
 * Jorgeminator
 * Kai Bakker (kaibakker)
 * Mai-Hsuan Chia (mhchia)