Update runtime files.
diff --git a/runtime/syntax/slice.vim b/runtime/syntax/slice.vim
index 8a4d675..4e2f9a8 100644
--- a/runtime/syntax/slice.vim
+++ b/runtime/syntax/slice.vim
@@ -20,6 +20,7 @@
 syn keyword sliceBoolean    false true
 
 " Include directives
+syn region  sliceIncluded    display contained start=+"+ skip=+\\\\\|\\"+ end=+"+
 syn match   sliceIncluded   display contained "<[^>]*>"
 syn match   sliceInclude    display "^\s*#\s*include\>\s*["<]" contains=sliceIncluded