Update runtime files.
diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 6365e36..08a532c 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -1,4 +1,4 @@
-*syntax.txt* For Vim version 8.1. Last change: 2019 Sep 19
+*syntax.txt* For Vim version 8.1. Last change: 2019 Oct 04
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -60,8 +60,8 @@
the path in another way (see |$VIMRUNTIME|). Usually this works just
fine. If it doesn't, try setting the VIM environment variable to the
directory where the Vim stuff is located. For example, if your syntax files
-are in the "/usr/vim/vim50/syntax" directory, set $VIMRUNTIME to
-"/usr/vim/vim50". You must do this in the shell, before starting Vim.
+are in the "/usr/vim/vim81/syntax" directory, set $VIMRUNTIME to
+"/usr/vim/vim81". You must do this in the shell, before starting Vim.
This command also sources the |menu.vim| script when the GUI is running or
will start soon. See |'go-M'| about avoiding that.