diff --git a/AUTHORS b/AUTHORS
index 46948d5fd..0a11ce87e 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -13,7 +13,7 @@ chgrp: David MacKenzie, Jim Meyering
 chmod: David MacKenzie, Jim Meyering
 chown: David MacKenzie, Jim Meyering
 chroot: Roland McGrath
-cksum: Q. Frank Xia
+cksum: Padraig Brady, Q. Frank Xia
 comm: Richard M. Stallman, David MacKenzie
 coreutils: Alex Deymo
 cp: Torbjorn Granlund, David MacKenzie, Jim Meyering
diff --git a/src/digest.c b/src/digest.c
index c7bb02b6a..122b75d8f 100644
--- a/src/digest.c
+++ b/src/digest.c
@@ -135,7 +135,9 @@
   proper_name ("Kayvan Aghaiepour"), \
   proper_name ("David MacKenzie")
 #elif HASH_ALGO_CKSUM
-# define AUTHORS proper_name ("Q. Frank Xia")
+# define AUTHORS \
+  proper_name ("Padraig Brady"), \
+  proper_name ("Q. Frank Xia")
 #elif HASH_ALGO_BLAKE2
 # define AUTHORS \
   proper_name ("Padraig Brady"), \