Update runtime files.
diff --git a/runtime/syntax/sudoers.vim b/runtime/syntax/sudoers.vim
index df1eb99..31f5f2b 100644
--- a/runtime/syntax/sudoers.vim
+++ b/runtime/syntax/sudoers.vim
@@ -1,7 +1,8 @@
" Vim syntax file
" Language: sudoers(5) configuration files
" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
-" Latest Revision: 2011-02-24
+" Latest Revision: 2018-07-19
+" Recent Changes: Support for #include and #includedir.
if exists("b:current_syntax")
finish
@@ -24,6 +25,7 @@
syn keyword sudoersTodo contained TODO FIXME XXX NOTE
syn region sudoersComment display oneline start='#' end='$' contains=sudoersTodo
+syn region sudoersInclude display oneline start='#\(include\|includedir\)' end='$'
syn keyword sudoersAlias User_Alias Runas_Alias nextgroup=sudoersUserAlias skipwhite skipnl
syn keyword sudoersAlias Host_Alias nextgroup=sudoersHostAlias skipwhite skipnl
@@ -335,6 +337,7 @@
hi def link sudoersStringValue String
hi def link sudoersListValue String
hi def link sudoersPASSWD Special
+hi def link sudoersInclude Statement
let b:current_syntax = "sudoers"