diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 6b8cd55af..e1a048245 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -47,6 +47,8 @@ class UsersController < ApplicationController
       @user.save
       if @user.errors.empty?
         session[:user_id] = @user.id
+      else
+        flash[:notice] = "Sign up failed: #{@user.errors.full_messages.join("; ")}"
       end
       set_current_user
       respond_with(@user)