Update runtime files
diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index eae83d4..89238d9 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -1,4 +1,4 @@
-*autocmd.txt* For Vim version 8.1. Last change: 2018 May 03
+*autocmd.txt* For Vim version 8.1. Last change: 2018 Dec 28
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -759,13 +759,14 @@
Not triggered when 'shelltemp' is off.
*FilterWritePost*
FilterWritePost After writing a file for a filter command or
- making a diff.
+ making a diff with an external diff (see
+ DiffUpdated for internal diff).
Vim checks the pattern against the name of
the current buffer as with FilterWritePre.
Not triggered when 'shelltemp' is off.
*FilterWritePre*
FilterWritePre Before writing a file for a filter command or
- making a diff.
+ making a diff with an external diff.
Vim checks the pattern against the name of
the current buffer, not the name of the
temporary file that is the output of the