man: clarify mount.ceph auth options

Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com>

diff --git a/doc/man/8/mount.ceph.rst b/doc/man/8/mount.ceph.rst
index 336efc1387a00231ab785b2152ff2e7283fc48d5..579bf378873c201712cf0066cfe581077c177cab 100644 (file)
--- a/doc/man/8/mount.ceph.rst
+++ b/doc/man/8/mount.ceph.rst
@@ -81,10 +81,14 @@ Options
   string, set the name of the hidden snapdir. Default: .snap
 
 :command:`name`
-  string, used with cephx, Default: guest
+  RADOS user to authenticate as when using cephx. Default: guest
 
 :command:`secret`
-  string, used with cephx
+  secret key for use with cephx. This option is insecure because it exposes
+  the secret on the command line. To avoid this, use the secretfile option.
+
+:command:`secretfile`
+  path to file containing the secret key to use with cephx
 
 :command:`ip`
   my ip