diff --git a/doc/ack.texi b/doc/ack.texi
index a2799404f..59029ce48 100644
--- a/doc/ack.texi
+++ b/doc/ack.texi
@@ -53,6 +53,7 @@ Bugfixes, documentation, encouragement, and code has been contributed by:
 @item David Love
 @item Björn Sandell
 @item Michael B Allen
+@item Douglas E Engert
 @item and we hope that those not mentioned here will forgive us.
 @end table