diff --git a/preface.asciidoc b/preface.asciidoc
index 02b24bb5..94235540 100644
--- a/preface.asciidoc
+++ b/preface.asciidoc
@@ -159,6 +159,7 @@ Many contributors offered comments, corrections, and additions to the early-rele
 * drstrangeM
 * Ed Eykholt (edeykholt)
 * Ed Leafe (EdLeafe)
+* Elias Rodrigues (elias19r)
 * Eric Voskuil (evoskuil)
 * Eric Winchell (winchell)
 * Erik Wahlström (erikwam)
@@ -199,4 +200,6 @@ Many contributors offered comments, corrections, and additions to the early-rele
 * Thiago Arrais (thiagoarrais)
 * venzen
 * Will Binns (wbnns)
+* wjx
 * Wojciech Langiewicz (wlk)
+* yurigeorgiev4