docs

examples/blog/app.js

@@ -30,8 +30,11 @@ app.configure(function(){
 // Locals
 
 app.locals.use(function(req, res){
+  // expose "error" and "message" to all
+  // views that are rendered.
   res.locals.error = req.session.error || '';
   res.locals.message = req.session.message || '';
+  // remove them so they're not displayed on subsequent renders
   delete req.session.error;
   delete req.session.message;
 });