diff --git a/klein.php b/klein.php
index 725d001..2c4d43e 100644
--- a/klein.php
+++ b/klein.php
@@ -1,6 +1,6 @@
 <?php
 
-class Klein {  
+class Klein {
     private $code;
 
     function compile($html) {
@@ -10,16 +10,17 @@ class Klein {
             return ["/$body/",
                 function ($x) use ($result) {
                     $code = "<?php " . preg_replace_callback("/#(\d+)(s?)/", function ($s) use($x) {
-                        $pref = $s[2] == 's' ? '$' : '';
-                        return implode(", ", array_map(function ($s) use($pref) { 
+                            $pref = $s[2] == 's' ? '$' : '';
+                            return implode(", ", array_map(function ($s) use($pref) {
                                 return $pref.preg_replace("/\.\s*(\w+)/", "['$1']", $s); }, preg_split("/\s*,\s*/", $x[$s[1]])));
-                    }, $result) . " ?>";
+                        }, $result) . " ?>";
                     return ($x[0][2] == '!') ? "<!-- $code -->" : $code;
                 }];
         }, [
             ["{% for+:id+in+:var %}", "foreach(#2s as \$index => #1s): \$loop = Klein::loop(\$index, #2s);"],
             ["{% for+:id , :id+in+:var %}", "foreach(#3s as #1s => #2s):"],
             ["{% endfor %}", "endforeach;"],
+            ["{% ifset+:var %}", "if(isset(#1s)):"],
             ["{% if+:var %}", "if(isset(#1s) && #1s):"],
             ["{% unless+:var %}", "if(!(isset(#1s) && #1s)):"],
             ["{% else %}", "else:"],
@@ -30,7 +31,7 @@ class Klein {
             ["{% macro+:id \(( :id (, :id )*)?\) %}", "function macro_#1(#2s) {"],
             ["{% endmacro %}", "}"]
         ]);
-  
+
         $result = file_get_contents($html);
         foreach($pattern as $arg) {
             $result = preg_replace_callback($arg[0], $arg[1], $result);
@@ -42,10 +43,10 @@ class Klein {
     static function loop($idx, &$array) {
         $is_even =  $idx % 2;
         return ['first' => $idx == 0
-                , 'last' => $idx == count($array) - 1
-                , 'odd' => !$is_even
-                , 'even' => $is_even];
-    }        
+            , 'last' => $idx == count($array) - 1
+            , 'odd' => !$is_even
+            , 'even' => $is_even];
+    }
 
     function render($vars) {
         extract($vars);