Clarify that mkrelease script must not muck with the export

diff --git a/build/mkrelease b/build/mkrelease
index 906a78ab8920145741974d4e3138be2a5fb069f0..cf01220a4b42308272a3bc45c708ece0834f9743 100755 (executable)
--- a/build/mkrelease
+++ b/build/mkrelease
@@ -9,6 +9,11 @@
 # where CVSTAG is the tag to export from the current CVSROOT
 #
 
+#
+# This script MUST NOT add files to the export nor modify
+# any file in the export.
+#
+
 set -e                 # exit immediately if any errors occur
 
 if test $# != 3 ; then