[4.0] 5a68ff7 add label

[Per Buer]

commit 5a68ff7e4e9744decb01566bd1ccac8c6734e476
Author: Per Buer <perbu at varnish-software.com>
Date:   Thu Feb 20 19:40:56 2014 +0100

    add label

diff --git a/doc/sphinx/users-guide/vcl-syntax.rst b/doc/sphinx/users-guide/vcl-syntax.rst
index c979bb5..14e07ed 100644
--- a/doc/sphinx/users-guide/vcl-syntax.rst
+++ b/doc/sphinx/users-guide/vcl-syntax.rst
@@ -25,6 +25,8 @@ including ", newline and other control characters except for the NUL
 (0x00) character. If you really want NUL characters in a string there
 is a VMOD that makes it possible to create such strings.
 
+.. _vcl_syntax_acl:
+
 Access control lists (ACLs)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~