--- a/metadata.xml	2011-09-13 19:53:17.000000000 +0200
+++ b/metadata.xml	2012-04-10 21:32:48.000000000 +0200
@@ -13,6 +13,12 @@
 <use>
 	<flag name="hesiod">Install hesiod module</flag>
 	<flag name="ldap">Install LDAP module</flag>
+	<flag name="mount-locking">
+		Enable locking to prevent corruption of /etc/mtab in the presence of
+		concurrent auto-mounting. If enabled, recursive auto-mounting (eg. using
+		autofs to bind or loop mount a filesystem which is itself auto-mounted)
+		is not possible.
+	</flag>
 	<flag name="sasl">Enable SASL support in the LDAP module</flag>
 </use>
 </pkgmetadata>