Index: src/wp-admin/install.php
===================================================================
--- src/wp-admin/install.php	(revision 49090)
+++ src/wp-admin/install.php	(working copy)
@@ -222,11 +222,12 @@
 }
 
 /**
+ * @global wpdb   $wpdb                   WordPress database abstraction object.
  * @global string $wp_version             The WordPress version string.
  * @global string $required_php_version   The required PHP version string.
  * @global string $required_mysql_version The required MySQL version string.
  */
-global $wp_version, $required_php_version, $required_mysql_version;
+global $wp_version, $wpdb, $required_php_version, $required_mysql_version;
 
 $php_version   = phpversion();
 $mysql_version = $wpdb->db_version();