Updated runtime files.
diff --git a/runtime/doc/diff.txt b/runtime/doc/diff.txt
index 378874f..7361d42 100644
--- a/runtime/doc/diff.txt
+++ b/runtime/doc/diff.txt
@@ -1,4 +1,4 @@
-*diff.txt* For Vim version 8.0. Last change: 2016 Aug 24
+*diff.txt* For Vim version 8.0. Last change: 2017 Feb 03
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -131,6 +131,8 @@
related options only happens in a window that has 'diff' set,
if the current window does not have 'diff' set then no options
in it are changed.
+ Hidden buffers are also removed from the list of diff'ed
+ buffers.
The `:diffoff` command resets the relevant options to the values they had when
using `:diffsplit`, `:diffpatch` , `:diffthis`. or starting Vim in diff mode.
@@ -164,7 +166,8 @@
All the buffers edited in a window where the 'diff' option is set will join in
the diff. This is also possible for hidden buffers. They must have been
-edited in a window first for this to be possible.
+edited in a window first for this to be possible. To get rid of the hidden
+buffers use `:diffoff!`.
*:DiffOrig* *diff-original-file*
Since 'diff' is a window-local option, it's possible to view the same buffer