diff --git a/zdump.c b/zdump.c
index bb93d5b..78f8434 100644
--- a/zdump.c
+++ b/zdump.c
@@ -1,3 +1,8 @@
+/*
+** This file is in the public domain, so clarified as of
+** 2009-05-17 by Arthur David Olson.
+*/
+
 static char	elsieid[] = "%W%";
 
 /*