diff --git a/design/XFS_Filesystem_Structure/metadump.asciidoc b/design/XFS_Filesystem_Structure/metadump.asciidoc
index a32d642..226622c 100644
--- a/design/XFS_Filesystem_Structure/metadump.asciidoc
+++ b/design/XFS_Filesystem_Structure/metadump.asciidoc
@@ -119,7 +119,16 @@
 |=====
 
 *xmh_incompat_flags*::
-Must be zero.
+A combination of the following flags:
+
+.Metadump v2 incompat flags
+[options="header"]
+|=====
+| Flag				| Description
+| +XFS_MD2_INCOMPAT_RTDEVICE+	|
+Dump contains realtime device contents.
+
+|=====
 
 *xmh_reserved*::
 Must be zero.
@@ -143,6 +152,7 @@
 | Value		| Description
 | 0		| Data device
 | 1		| External log
+| 2		| Realtime device
 |=====
 
 The lower 54 bits determine the device address from which the dump data was