NFSD: Added fault injection documentation

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/Documentation/filesystems/nfs/00-INDEX b/Documentation/filesystems/nfs/00-INDEX
index a57e124..1716874a 100644
--- a/Documentation/filesystems/nfs/00-INDEX
+++ b/Documentation/filesystems/nfs/00-INDEX
@@ -2,6 +2,8 @@
 	- this file (nfs-related documentation).
 Exporting
 	- explanation of how to make filesystems exportable.
+fault_injection.txt
+	- information for using fault injection on the server
 knfsd-stats.txt
 	- statistics which the NFS server makes available to user space.
 nfs.txt