diff --git a/src/phpDocumentor/GraphViz/Graph.php b/src/phpDocumentor/GraphViz/Graph.php
index fcca4dc..e933d74 100644
--- a/src/phpDocumentor/GraphViz/Graph.php
+++ b/src/phpDocumentor/GraphViz/Graph.php
@@ -24,7 +24,7 @@
  * @copyright 2010-2011 Mike van Riel / Naenius (http://www.naenius.com)
  * @license   http://www.opensource.org/licenses/mit-license.php MIT
  * @link      http://phpdoc.org
- * 
+ *
  * @method Graph setRankSep(string $rankSep)
  * @method Graph setCenter(string $center)
  * @method Graph setRank(string $rank)
@@ -41,6 +41,9 @@ class Graph
     /** @var string Type of this graph; may be digraph, graph or subgraph */
     protected $type = 'digraph';
 
+    /** @var bool If the graph is strict then multiple edges are not allowed between the same pairs of nodes */
+    protected $strict = false;
+
     /** @var \phpDocumentor\GraphViz\Attribute[] A list of attributes for this Graph */
     protected $attributes = array();
 
@@ -53,6 +56,7 @@ class Graph
     /** @var \phpDocumentor\GraphViz\Edge[] A list of edges / arrows for this Graph */
     protected $edges = array();
 
+    /** @var string The path to execute dot from */
     protected $path = '';
 
     /**
@@ -148,6 +152,28 @@ public function getType()
         return $this->type;
     }
 
+    /**
+     * Set if the Graph should be strict. If the graph is strict then
+     * multiple edges are not allowed between the same pairs of nodes
+     *
+     * @param bool $isStrict
+     *
+     * @return \phpDocumentor\GraphViz\Graph
+     */
+    public function setStrict($isStrict)
+    {
+        $this->strict = $isStrict;
+        return $this;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isStrict()
+    {
+        return $this->strict;
+    }
+
     /**
      * Magic method to provide a getter/setter to add attributes on the Graph.
      *
@@ -375,8 +401,10 @@ public function __toString()
         }
         $attributes = implode(PHP_EOL, $attributes);
 
+        $strict = ($this->isStrict() ? 'strict ' : '');
+
         return <<<DOT
-{$this->getType()} "{$this->getName()}" {
+{$strict}{$this->getType()} "{$this->getName()}" {
 $attributes
 }
 DOT;
diff --git a/tests/phpDocumentor/GraphViz/Test/GraphTest.php b/tests/phpDocumentor/GraphViz/Test/GraphTest.php
index 29d33c5..96d22e1 100644
--- a/tests/phpDocumentor/GraphViz/Test/GraphTest.php
+++ b/tests/phpDocumentor/GraphViz/Test/GraphTest.php
@@ -144,6 +144,39 @@ public function testGetType()
         );
     }
 
+    public function testSetStrict()
+    {
+        $this->assertSame(
+            $this->fixture, $this->fixture->setStrict(true),
+            'Expecting a fluent interface'
+        );
+        $this->assertSame(
+            $this->fixture, $this->fixture->setStrict(false),
+            'Expecting a fluent interface'
+        );
+    }
+
+    public function testIsStrict()
+    {
+        $this->assertSame(
+            $this->fixture->isStrict(),
+            false
+        );
+        $this->fixture->setStrict(true);
+        $this->assertSame(
+            $this->fixture->isStrict(),
+            true
+        );
+    }
+
+    public function testSetPath()
+    {
+        $this->assertSame(
+            $this->fixture, $this->fixture->setPath(__DIR__),
+            'Expecting a fluent interface'
+        );
+    }
+
     /**
      * @covers phpDocumentor\GraphViz\Graph::__call
      */
@@ -317,6 +350,12 @@ public function test__toString()
             (string) $graph,
             ('digraph "My First Graph" {' . PHP_EOL . 'label="PigeonPost"' . PHP_EOL . '}')
         );
+
+        $graph->setStrict(true);
+        $this->assertSame(
+            (string) $graph,
+            ('strict digraph "My First Graph" {' . PHP_EOL . 'label="PigeonPost"' . PHP_EOL . '}')
+        );
     }
 
 }