Update runtime files.
diff --git a/runtime/indent/logtalk.vim b/runtime/indent/logtalk.vim
index 5b69663..8e36f86 100644
--- a/runtime/indent/logtalk.vim
+++ b/runtime/indent/logtalk.vim
@@ -1,5 +1,5 @@
" Maintainer: Paulo Moura <pmoura@logtalk.org>
-" Revised on: 2008.06.02
+" Revised on: 2018.08.04
" Language: Logtalk
" This Logtalk indent file is a modified version of the Prolog
@@ -42,6 +42,9 @@
" Check for clause head on previous line
elseif pline =~ ':-\s*\(%.*\)\?$'
let ind = ind + shiftwidth()
+ " Check for grammar rule head on previous line
+ elseif pline =~ '-->\s*\(%.*\)\?$'
+ let ind = ind + shiftwidth()
" Check for entity closing directive on previous line
elseif pline =~ '^\s*:-\send_\(object\|protocol\|category\)\.\(%.*\)\?$'
let ind = ind - shiftwidth()