[sheepdog] [PATCH 2/2] comment what simple store is

[yamamoto at valinux.co.jp]

From: YAMAMOTO Takashi <yamt at mwd.biglobe.ne.jp>

---
 doc/farm-internal.txt |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/doc/farm-internal.txt b/doc/farm-internal.txt
index 74fa547..6cda704 100644
--- a/doc/farm-internal.txt
+++ b/doc/farm-internal.txt
@@ -9,7 +9,10 @@
 Farm is an object store for Sheepdog on node basis. It consists of backend
 store, which caches the snapshot objects, and working directory, storing
 objects that Sheepdog currently operates. That being said, the I/O performance
-for VM Guests would be practically the same as Simple Store.
+for VM Guests would be practically the same as Simple Store. [*]
+
+[*] Simple Store is an older storage backend which has been removed from
+the tree.
 
 Snapshots are triggered either by system recovery code or users, and Farm is
 supposed to restore all the object states into the ones at the time of the user
-- 
1.7.10.4