diff --git a/application/controllers/Categories.php b/application/controllers/Categories.php
index c52b883..1e56596 100644
--- a/application/controllers/Categories.php
+++ b/application/controllers/Categories.php
@@ -13,7 +13,9 @@ public function index(){
 		public function create(){
 			$data['title'] = 'Create Category';
 
-			$this->form_validation->set_rules('name', 'Name', 'required');
+			$this->form_validation->set_rules('name', 'Name', 'required|is_unique[categories.name]', array(
+                      'is_unique' => 'This Category already exists.'
+                         ));
 
 			if($this->form_validation->run() === FALSE){
 				$this->load->view('templates/header');
@@ -34,4 +36,4 @@ public function posts($id){
 			$this->load->view('posts/index', $data);
 			$this->load->view('templates/footer');
 		}
-	}
\ No newline at end of file
+	}