diff --git a/README.md b/README.md
index 8697455..d6f240d 100644
--- a/README.md
+++ b/README.md
@@ -6,13 +6,13 @@ Database and table needed, build on MariaDB / MySQL:
 
 	CREATE DATABASE IF NOT EXISTS `shortr` DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci;
 	USE `shortr`;
-
 	CREATE TABLE `urls` (
 	  `id` varchar(255) NOT NULL,
 	  `url` text DEFAULT NULL,
 	  `timestamp` timestamp NOT NULL DEFAULT current_timestamp(),
 	  `ip` varchar(255) DEFAULT NULL,
-	  `count` int(11) NOT NULL
+	  `count` int(11) NOT NULL,
+          PRIMARY KEY (`id`)
 	) ENGINE=InnoDB DEFAULT CHARSET=latin1;