diff --git a/runtime/syntax/aidl.vim b/runtime/syntax/aidl.vim
index 1947ab9..3a79433 100644
--- a/runtime/syntax/aidl.vim
+++ b/runtime/syntax/aidl.vim
@@ -2,7 +2,7 @@
 " Language:	aidl (Android Interface Definition Language)
 "		https://developer.android.com/guide/components/aidl
 " Maintainer:	Dominique Pelle <dominique.pelle@tomtom.com>
-" LastChange:	2020/07/25
+" LastChange:	2020/12/03
 
 " Quit when a syntax file was already loaded.
 if exists("b:current_syntax")
@@ -12,7 +12,7 @@
 source <sfile>:p:h/java.vim
 
 syn keyword aidlParamDir in out inout
-syn keyword aidlKeyword oneway parcelable
+syn keyword aidlKeyword const oneway parcelable
 
 " Needed for the 'in', 'out', 'inout' keywords to be highlighted.
 syn cluster javaTop add=aidlParamDir
diff --git a/runtime/syntax/diff.vim b/runtime/syntax/diff.vim
index b656cd9..ac43d66 100644
--- a/runtime/syntax/diff.vim
+++ b/runtime/syntax/diff.vim
@@ -2,7 +2,7 @@
 " Language:	Diff (context or unified)
 " Maintainer:	Bram Moolenaar <Bram@vim.org>
 "               Translations by Jakson Alves de Aquino.
-" Last Change:	2016 Apr 02
+" Last Change:	2020 Dec 07
 
 " Quit when a (custom) syntax file was already loaded
 if exists("b:current_syntax")
@@ -346,9 +346,11 @@
 syn match diffLine	"^\d\+\(,\d\+\)\=[cda]\d\+\>.*"
 
 syn match diffFile	"^diff\>.*"
-syn match diffFile	"^+++ .*"
 syn match diffFile	"^Index: .*"
 syn match diffFile	"^==== .*"
+" Old style diff uses *** for old and --- for new.
+" Unified diff uses --- for old and +++ for new; names are wrong but it works.
+syn match diffOldFile	"^+++ .*"
 syn match diffOldFile	"^\*\*\* .*"
 syn match diffNewFile	"^--- .*"