Update runtime files.
diff --git a/runtime/doc/usr_09.txt b/runtime/doc/usr_09.txt
index ee33f94..1bc7aff 100644
--- a/runtime/doc/usr_09.txt
+++ b/runtime/doc/usr_09.txt
@@ -5,9 +5,10 @@
Using the GUI
-Vim works in an ordinary terminal. GVim can do the same things and a few
-more. The GUI offers menus, a toolbar, scrollbars and other items. This
-chapter is about these extra things that the GUI offers.
+Vim works in an ordinary terminal, while gVim has a Graphical User Interface
+(GUI). It can do the same things and a few more. The GUI offers menus, a
+toolbar, scrollbars and other items. This chapter is about these extra things
+that the GUI offers.
|09.1| Parts of the GUI
|09.2| Using the mouse