diff --git a/MysqliDb.php b/MysqliDb.php
index a90e2805..d10528c8 100644
--- a/MysqliDb.php
+++ b/MysqliDb.php
@@ -942,9 +942,9 @@ public function orHaving($havingProp, $havingValue = null, $operator = null)
      * @throws Exception
      * @return MysqliDb
      */
-    public function join($joinTable, $joinCondition, $joinType = '')
+    public function join($joinTable, $joinCondition = NULL, $joinType = 'NATURAL')
     {
-        $allowedTypes = array('LEFT', 'RIGHT', 'OUTER', 'INNER', 'LEFT OUTER', 'RIGHT OUTER');
+        $allowedTypes = array('NATURAL', 'LEFT', 'RIGHT', 'OUTER', 'INNER', 'LEFT OUTER', 'RIGHT OUTER');
         $joinType = strtoupper(trim($joinType));
 
         if ($joinType && !in_array($joinType, $allowedTypes)) {
@@ -2298,7 +2298,7 @@ protected function _buildJoin () {
             else
                 $joinStr = $joinTable;
 
-            $this->_query .= " " . $joinType. " JOIN " . $joinStr ." on " . $joinCondition;
+            $this->_query .= " " . $joinType. " JOIN " . $joinStr . ($joinCondition ? " on " . $joinCondition : "");
 
             // Add join and query
             if (!empty($this->_joinAnd) && isset($this->_joinAnd[$joinStr])) {
diff --git a/readme.md b/readme.md
index 7e2b16e0..3310c11d 100644
--- a/readme.md
+++ b/readme.md
@@ -600,6 +600,14 @@ print_r ($products);
 // Gives: SELECT  u.login, p.productName FROM products p LEFT JOIN users u ON (p.tenantID=u.tenantID OR u.tenantID = 5)
 ```
 
+### NATURAL JOIN method
+```php
+$db->join("users");
+$products = $db->get ("products");
+print_r ($products);
+// Gives: SELECT * FROM products NATURAL JOIN users
+```
+
 ### Properties sharing
 Its is also possible to copy properties