diff --git a/fs/cifs/README b/fs/cifs/README
index 5d9a953..e7a3ce6 100644
--- a/fs/cifs/README
+++ b/fs/cifs/README
@@ -296,6 +296,8 @@
 		unused.
   rsize		default read size (usually 16K)
   wsize		default write size (usually 16K, 32K is often better over GigE)
+		maximum wsize currently allowed by CIFS is 57344 (14 4096 byte
+		pages)
   rw		mount the network share read-write (note that the
 		server may still consider the share read-only)
   ro		mount network share read-only