update two mount options(discard, nfs) in vfat.txt.

Signed-off-by: Namjae Jeon <linkinj...@gmail.com>
---
 Documentation/filesystems/vfat.txt |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/filesystems/vfat.txt 
b/Documentation/filesystems/vfat.txt
index ead764b..f643f69 100644
--- a/Documentation/filesystems/vfat.txt
+++ b/Documentation/filesystems/vfat.txt
@@ -137,6 +137,17 @@ errors=panic|continue|remount-ro
                 without doing anything or remount the partition in
                 read-only mode (default behavior).
 
+discard       -- If set, issues discard/TRIM commands to the block
+                device when blocks are freed. This is useful for SSD devices
+                and sparse/thinly-provisoned LUNs.
+
+nfs           -- This option maintains an index (cache) of directory
+                inodes by i_logstart which is used by the nfs-related code to
+                improve look-ups.
+
+                Enable this only if you want to export the FAT filesystem
+                over NFS
+
 <bool>: 0,1,yes,no,true,false
 
 TODO
-- 
1.7.9.5

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