diff --git a/private.h b/private.h
index 09e019b..3ccb531 100644
--- a/private.h
+++ b/private.h
@@ -288,7 +288,7 @@ char *ctime_r P((time_t const *, char *));
 #endif /* HAVE_INCOMPATIBLE_CTIME_R */
 
 /*
-** UNIX was a registered trademark of UNIX System Laboratories in 1993.
+** UNIX was a registered trademark of The Open Group in 2003.
 */
 
 #endif /* !defined PRIVATE_H */