Update runtime files.
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index be53e9f..128b34c 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt* For Vim version 8.1. Last change: 2018 Dec 27
+*options.txt* For Vim version 8.1. Last change: 2019 Jan 16
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -2273,7 +2273,10 @@
deleted only once. Also when repeating "R" with "."
and a count.
*cpo-y*
- y A yank command can be redone with ".".
+ y A yank command can be redone with ".". Think twice if
+ you really want to use this, it may break some
+ plugins, since most people expect "." to only repeat a
+ change.
*cpo-Z*
Z When using "w!" while the 'readonly' option is set,
don't reset 'readonly'.