diff --git a/krb5-1.3.4-send-pr-tempfile.patch b/krb5-1.3.4-send-pr-tempfile.patch
index 3bfaaaf..a9ffa31 100644
--- a/krb5-1.3.4-send-pr-tempfile.patch
+++ b/krb5-1.3.4-send-pr-tempfile.patch
@@ -1,3 +1,5 @@
+Use mktemp to create our temporary files instead of basing them on our PID.
+Only portable if you assume the presence of a mktemp helper.
 diff -ur krb5-1.3.4/src/util/send-pr/send-pr.sh krb5-1.3.4/src/util/send-pr/send-pr.sh
 --- krb5-1.3.4/src/util/send-pr/send-pr.sh	1997-03-20 01:13:56.000000000 +0100
 +++ krb5-1.3.4/src/util/send-pr/send-pr.sh	2004-09-20 11:28:56.000000000 +0200