docs: Document nvme-id-ns behavior when nsid is 0xFFFFFFFF

as documented in NVM Command Set Specification Revision 1.0b,
chapter 4.1.5.1 - NVM Command Set Identify Namespace Data Structure (CNS 00h).

diff --git a/Documentation/nvme-id-ns.txt b/Documentation/nvme-id-ns.txt
index d12b1576da7a90aa8f8c4d44f1d470dd13ed90df..a2ac155484ce8ff8468f3b1c18936bd86a896616 100644 (file)
--- a/Documentation/nvme-id-ns.txt
+++ b/Documentation/nvme-id-ns.txt
@@ -35,7 +35,10 @@ OPTIONS
 --namespace-id=<nsid>::
        Retrieve the identify namespace structure for the given nsid. This
        is required for the character devices, or overrides the block nsid
-       if given.
+       if given. If the controller supports namespace management capability
+       and 0xFFFFFFFF is given, then the controller returns the identify
+       namespace structure that specifies common capabilities across
+       namespaces for the controller.
 
 --force::
        Request controller return the identify namespace structure even