diff --git a/metadata.xml b/metadata.xml
index bbbd6a5..d29de99 100644
--- a/metadata.xml
+++ b/metadata.xml
@@ -5,5 +5,6 @@
   <use>
     <flag name='build-generic'>Build and install a generic kernel (recommended).</flag>
     <flag name='dtrace'>Enable DTrace support.</flag>
+    <flag name='zfs'>Enable ZFS support.</flag>
   </use>
 </pkgmetadata>