More documentation updates for 0.9

Author: mitsuhiko

docs/extensiondev.rst

@@ -224,7 +224,9 @@ So here's what these lines of code do:
     one.
 3.  Next, we define a ``connect`` method that opens a database connection.
 4.  Finally, we add a ``connection`` property that on first access opens
-    the database connection and stores it on the context.
+    the database connection and stores it on the context.  This is also
+    the recommended way to handling resources: fetch resources lazily the
+    first time they are used.
 
     Note here that we're attaching our database connection to the top
     application context via ``_app_ctx_stack.top``. Extensions should use

docs/upgrading.rst

@@ -34,6 +34,12 @@ the old behavior, you can add it easily by subclassing Flask::
                 return self.response_class(*rv)
             return Flask.make_response(self, rv)
 
+If you have an extension that was using :data:`~flask._request_ctx_stack`
+before, please consider changing to :data:`~flask._app_ctx_stack` if it
+makes sense for your extension.  This will for example be the case for
+extensions that connect to databases.  This will allow your users to
+easier use your extension with more complex use cases outside of requests.
+
 Version 0.8
 -----------