diff --git a/include/virtio_ring.h b/include/virtio_ring.h
index 52cbe77..c77c212 100644
--- a/include/virtio_ring.h
+++ b/include/virtio_ring.h
@@ -61,6 +61,8 @@
 	u32 len;
 	u16 flags;
 	u16 next;
+	/* Metadata about the descriptor. */
+	bool chain_head;
 };
 
 struct vring_avail {