[dia] dox: mention Graph Layout plug-in

[Hans Breuer <hans src gnome org>]

commit b58b68595ed3776402276c14a553bf7c0e50ab5c
Author: Hans Breuer <hans breuer org>
Date:   Sun Dec 15 21:34:07 2013 +0100

    dox: mention Graph Layout plug-in

 plug-ins/layout/layout.cpp |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/plug-ins/layout/layout.cpp b/plug-ins/layout/layout.cpp
index 9faf942..6b066e4 100644
--- a/plug-ins/layout/layout.cpp
+++ b/plug-ins/layout/layout.cpp
@@ -23,8 +23,15 @@
  * \file layout.cpp - plugin for automatic diagram layout
  */
 /*!
- * \defgroup LayoutPlugin
+ * \defgroup LayoutPlugin Graph Layout Plugin
+ * \brief Connecting external graph layout libraries with Dia
+ *
  * \ingroup Plugins
+ *
+ * Dia's core facilities to do automatic layout is highly limited. This
+ * plug-in allows to connect external C++ libraries with Dia's objects
+ * simplified to nodes and edges. Changes done by the layout algorithm
+ * are connected with Dia's undo/redo system.
  */
 #include <config.h>