diff --git a/install.php b/install.php
index 8725df6d..3054bf10 100644
--- a/install.php
+++ b/install.php
@@ -1,7 +1,7 @@
 <?php
 
 // Installation/upgrade file	
-define('VERSION', 'v0.9.6-dev-12');
+define('VERSION', 'v0.9.6-dev-13');
 
 require 'inc/functions.php';
 
@@ -364,6 +364,10 @@ if (file_exists($config['has_installed'])) {
 					CHANGE  `file`  `file` VARCHAR( 255 ) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL ;",
 					$board['uri'])) or error(db_error());
 			}
+		case 'v0.9.6-dev-12':
+			foreach ($boards as &$board) {
+				query(sprintf("ALTER TABLE  ``posts_%s`` ADD INDEX `ip` (`ip`)", $board['uri'])) or error(db_error());
+			}
 		case false:
 			// Update version number
 			file_write($config['has_installed'], VERSION);
diff --git a/templates/posts.sql b/templates/posts.sql
index 4eef3a0d..1e092985 100644
--- a/templates/posts.sql
+++ b/templates/posts.sql
@@ -28,6 +28,7 @@ CREATE TABLE IF NOT EXISTS ``posts_{{ board }}`` (
    UNIQUE KEY `id` (`id`),
    KEY `thread_id` (`thread`,`id`),
    KEY `time` (`time`),
-   FULLTEXT KEY `body` (`body`)
+   FULLTEXT KEY `body` (`body`),
+   KEY `ip` (`ip`),
  ) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 AUTO_INCREMENT=1 ;
  
\ No newline at end of file