diff --git a/preface.asciidoc b/preface.asciidoc
index 70b46a56..df2ba40e 100644
--- a/preface.asciidoc
+++ b/preface.asciidoc
@@ -242,6 +242,7 @@ Following is a list of notable GitHub contributors, including their GitHub ID in
 * Stephan Oeste (Emzy)
 * takaya-imai
 * Thiago Arrais (thiagoarrais)
+* Thomas Kerin (afk11)
 * venzen
 * Will Binns (wbnns)
 * wintercooled