Runtime files update.
diff --git a/runtime/doc/windows.txt b/runtime/doc/windows.txt
index fa94896..d999962 100644
--- a/runtime/doc/windows.txt
+++ b/runtime/doc/windows.txt
@@ -1,4 +1,4 @@
-*windows.txt* For Vim version 8.1. Last change: 2019 Aug 04
+*windows.txt* For Vim version 8.1. Last change: 2019 Aug 18
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -872,6 +872,7 @@
settings. The option is a comma separated list of values:
height maximum height of the popup
width maximum width of the popup
+ highlight highlight group of the popup (default is Pmenu)
Example: >
:set previewpopup=height:10,width:60