diff --git a/preface.asciidoc b/preface.asciidoc
index 7e2b6e18..8e490082 100644
--- a/preface.asciidoc
+++ b/preface.asciidoc
@@ -199,15 +199,15 @@ Many contributors offered comments, corrections and additions to the early-relea
 ===== (Name - Github ID)
 
 * *Minh T. Nguyen - enderminh: Github contribution editor*
+* Erik Wahlström - erikwam
 * Eric Winchell - winchell
+* Richard Kiss - richardkiss
 * Sergej Kotliar - ziggamon
-* Erik Wahlström - erikwam 
-* ishotjr
+* Nagaraj Hubli - nagarajhubli
+* Michalis Kargakis - kargakis
+* Ish Ot Jr. - ishotjr
+* Alex Waters - alexwaters
 * Mihail Russu - MihailRussu
-
-
-
-
-
-
-
+* James Addison - jayaddison
+* Joe Bauers - joebauers
+* Stephan Oeste - Emzy