diff --git a/CREDITS b/CREDITS
index 72e7eeca..d711813f 100644
--- a/CREDITS
+++ b/CREDITS
@@ -43,6 +43,9 @@ Franck Joncourt
       chmod().
     - Contributed a patch to allow the fwknop client to be stopped with Ctrl-C
       before sending an SPA packet on the wire.
+    - Contributed a patch to ensure that duplicate iptables rules are not
+      created even for different SPA packets that arrive at the same time and
+      request the same access.
 
 Jonathan Schulz
     - Submitted patches to change HTTP connection type to 'close' for -R mode