diff --git a/src/MySql/AuditDiff.php b/src/MySql/AuditDiff.php
old mode 100644
new mode 100755
index 2333419..f92dbab
--- a/src/MySql/AuditDiff.php
+++ b/src/MySql/AuditDiff.php
@@ -56,17 +56,8 @@ class AuditDiff
 
   /**
    * Array with columns for each table.
-   * array [
-   *    table_name [
-   *            column [
-   *                    data table type,
-   *                    audit table type
-   *                    ],
-   *                      ...
-   *               ]
-   *       ]
    *
-   * @var array[]
+   * @var array<string,AuditDiffTable>
    */
   private $diffColumns;