Update runtime files
diff --git a/runtime/doc/intro.txt b/runtime/doc/intro.txt
index 27f0cc6..287a1d6 100644
--- a/runtime/doc/intro.txt
+++ b/runtime/doc/intro.txt
@@ -1,4 +1,4 @@
-*intro.txt* For Vim version 8.0. Last change: 2017 Aug 05
+*intro.txt* For Vim version 8.0. Last change: 2017 Aug 24
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -839,10 +839,12 @@
==============================================================================
8. Definitions *definitions*
+ buffer Contains lines of text, usually read from a file.
screen The whole area that Vim uses to work in. This can be
a terminal emulator window. Also called "the Vim
window".
- window A view on a buffer.
+ window A view on a buffer. There can be multiple windows for
+ one buffer.
A screen contains one or more windows, separated by status lines and with the
command line at the bottom.