Update runtime files.
diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 9f062fc..04387f7 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -1,4 +1,4 @@
-*syntax.txt* For Vim version 8.0. Last change: 2018 Jan 27
+*syntax.txt* For Vim version 8.0. Last change: 2018 Jan 31
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -2779,13 +2779,10 @@
SCHEME *scheme.vim* *ft-scheme-syntax*
-By default only R5RS keywords are highlighted and properly indented.
+By default only R7RS keywords are highlighted and properly indented.
-MzScheme-specific stuff will be used if b:is_mzscheme or g:is_mzscheme
-variables are defined.
-
-Also scheme.vim supports keywords of the Chicken Scheme->C compiler. Define
-b:is_chicken or g:is_chicken, if you need them.
+scheme.vim also supports extensions of the CHICKEN Scheme->C compiler.
+Define b:is_chicken or g:is_chicken, if you need them.
SDL *sdl.vim* *ft-sdl-syntax*