Update runtime files.
diff --git a/runtime/syntax/awk.vim b/runtime/syntax/awk.vim
index c9696e6..43455b8 100644
--- a/runtime/syntax/awk.vim
+++ b/runtime/syntax/awk.vim
@@ -1,7 +1,7 @@
" Vim syntax file
" Language: awk, nawk, gawk, mawk
" Maintainer: Antonio Colombo <azc100@gmail.com>
-" Last Change: 2020 Mar 25
+" Last Change: 2020 Aug 18
" AWK ref. is: Alfred V. Aho, Brian W. Kernighan, Peter J. Weinberger
" The AWK Programming Language, Addison-Wesley, 1988
@@ -27,6 +27,8 @@
let s:cpo_save = &cpo
set cpo&vim
+syn iskeyword @,48-57,_,192-255,@-@
+
" A bunch of useful Awk keywords
" AWK ref. p. 188
syn keyword awkStatement break continue delete exit