docs: Add nvme command RETURNS section for #1560 requirement

Required information on how an invoking process might determine success or
failure.

Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>

diff --git a/Documentation/nvme.txt b/Documentation/nvme.txt
index 26fcb95e922a93d6e137331b41490d3db17f9aa7..87de7b837d9130237eef599287e9a6fcb59ee04d 100644 (file)
--- a/Documentation/nvme.txt
+++ b/Documentation/nvme.txt
@@ -45,6 +45,11 @@ Plugins/Vendor extension commands
 
 include::cmd-plugins.txt[]
 
+RETURNS
+-------
+All commands will behave the same, they will return 0 on success and 1 on
+failure.
+
 FURTHER DOCUMENTATION
 ---------------------
 See the freely available references on the http://nvmexpress.org[Official