diff --git a/README b/README
index 8c7f3f6..17c334a 100644
--- a/README
+++ b/README
@@ -43,6 +43,9 @@ fail. For those domains, add the domain to the file (one per line), and
 restart postfix so that the policy server can reload its configuration.
 The policy server will ignore the domain going forward.
 
+If defined, the configuration files described above need to have permissions
+to allow the policy server to read the files.
+
 The standard build for the policy server assumes that the postfix config file
 directory is /etc/postfix.  If this is not correct for your operating systemn,
 run the provided config.sh file from the package directory and it will update