diff --git a/doc/ack.texi b/doc/ack.texi
index f0ffcfa78..6384c348c 100644
--- a/doc/ack.texi
+++ b/doc/ack.texi
@@ -53,6 +53,7 @@ Bugfixes, documentation, encouragement, and code has been contributed by:
 @item Guido Günther
 @item Jason McIntyre
 @item Johan Ihrén
+@item John Center
 @item Jun-ichiro itojun Hagino
 @item KAMADA Ken'ichi
 @item Ken Hornstein