diff --git a/CREDITS.txt b/CREDITS.txt
index cb47f1be3..17fd6378c 100644
--- a/CREDITS.txt
+++ b/CREDITS.txt
@@ -2667,3 +2667,4 @@ Donald Wittenberg
 Bruce Bowden
 Gérard Chadeyras
 James D McKeown
+William Dilley