diff --git a/Documentation/filesystems/btrfs.txt b/Documentation/filesystems/btrfs.txt
index e87609a..7254cf5 100644
--- a/Documentation/filesystems/btrfs.txt
+++ b/Documentation/filesystems/btrfs.txt
@@ -98,9 +98,12 @@
 	can be avoided.  Especially useful when trying to mount a multi-device
 	setup as root.  May be specified multiple times for multiple devices.
 
+  nodiscard(*)
   discard
-	Issue frequent commands to let the block device reclaim space freed by
-	the filesystem.  This is useful for SSD devices, thinly provisioned
+	Disable/enable discard mount option.
+	Discard issues frequent commands 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 significant
 	performance impact.  (The fstrim command is also available to
 	initiate batch trims from userspace).