Updated runtime files.
diff --git a/runtime/doc/windows.txt b/runtime/doc/windows.txt
index af06ac8..81042db 100644
--- a/runtime/doc/windows.txt
+++ b/runtime/doc/windows.txt
@@ -1,4 +1,4 @@
-*windows.txt* For Vim version 7.4. Last change: 2016 Jul 30
+*windows.txt* For Vim version 7.4. Last change: 2016 Aug 18
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -75,7 +75,7 @@
The main Vim window can hold several split windows. There are also tab pages
|tab-page|, each of which can hold multiple windows.
-
+ *window-ID*
Each window has a unique identifier called the window ID. This identifier
will not change within a Vim session. The |win_getid()| and |win_id2tabwin()|
functions can be used to convert between the window/tab number and the