Update runtime files.
diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 29fae2c..c4f30e9 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -1,4 +1,4 @@
-*syntax.txt* For Vim version 8.1. Last change: 2018 Dec 14
+*syntax.txt* For Vim version 8.1. Last change: 2018 Dec 27
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -29,7 +29,7 @@
7. :syntax arguments |:syn-arguments|
8. Syntax patterns |:syn-pattern|
9. Syntax clusters |:syn-cluster|
-10. Including syntax files |:syn-include|
+10. Including syntax files |:syn-include|
11. Synchronizing |:syn-sync|
12. Listing syntax items |:syntax|
13. Highlight command |:highlight|