added intro text to doc index

--HG--
branch : trunk
diff --git a/docs/index.rst b/docs/index.rst
index db5c1b5..a6c8bf8 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -1,7 +1,9 @@
 Jinja2 Documentation
 ====================
 
-Welcome in the Jinja2 documentation.
+This is the documentation for the Jinja2 general purpose templating language.
+Jinja2 is a library for Python 2.4 and onwards that is designed to be flexible,
+fast and secure.
 
 .. toctree::
    :maxdepth: 2