diff --git a/ykksm-export.pl b/ykksm-export.pl
index b548d1e..5c15a44 100755
--- a/ykksm-export.pl
+++ b/ykksm-export.pl
@@ -49,7 +49,7 @@ sub usage {
     print "Usage example:\n";
     print "\n";
     print "  ./ykksm-export.pl --db-user foo --db-passwd pass123 |\n";
-    print "     gpg -a --encrypt -r 1D2F473E > keys.txt\n";
+    print "     gpg -a --sign --encrypt -r 1D2F473E > keys.txt\n";
     print "\n";
     exit 1;
 }