diff --git a/AUTHORS b/AUTHORS
index 8acc2397cb..0550c6744f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -126,6 +126,7 @@ Other Contributors:
 
 Mike Alexander Cap gains, lot and MacOS fixes.
 Andrew Arensburger for FreeBSD & other patches
+Simon Arlott  Previous/next working day SX; performance improvements; misc fixes/preferences
 Matt Armstrong for misc fixes
 Jon Arney  Windows porting patches, misc fixes
 A. Alper Atici Turkish translation