[PATCH] docs: add some clarification to xenstore-migration.md

[Juergen Gross <jgross@xxxxxxxx>]

The Xenstore migration document is missing the specification that a
node record must be preceded by the record of its parent node in case
of live update.

Add that missing part.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 docs/designs/xenstore-migration.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/designs/xenstore-migration.md 
b/docs/designs/xenstore-migration.md
index 5f1155273e..39e31c984b 100644
--- a/docs/designs/xenstore-migration.md
+++ b/docs/designs/xenstore-migration.md
@@ -316,6 +316,10 @@ a _committed_ node (globally visible in xenstored) or a 
_pending_ node (created
 or modified by a transaction for which there is also a `TRANSACTION_DATA`
 record previously present).
 
+In the live update case the _committed_ nodes must be in a top-down sequence,
+i.e. the first node needs to be `/`, and each other node in the stream must
+come _after_ its parent node.
+
 
 ```
     0       1       2       3    octet
-- 
2.34.1