1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/filesystems/xfs.txt b/Documentation/filesystems/xfs.txt
index 7bff3e4f35df..3fc0c31a6f5d 100644
--- a/Documentation/filesystems/xfs.txt
+++ b/Documentation/filesystems/xfs.txt
@@ -39,6 +39,12 @@ When mounting an XFS filesystem, the following options are accepted.
         drive level write caching to be enabled, for devices that
         support write barriers.
 
+  discard
+        Issue command to let the block device reclaim space freed by the
+        filesystem.  This is useful for SSD devices, thinly provisioned
+        LUNs and virtual machine images, but may have a performance
+        impact.  This option is incompatible with the nodelaylog option.
+
   dmapi
         Enable the DMAPI (Data Management API) event callouts.
         Use with the "mtpt" option.