diff --git a/lib/JpGraph/JpGraph.php b/lib/JpGraph/JpGraph.php
index 5460747..e56b518 100644
--- a/lib/JpGraph/JpGraph.php
+++ b/lib/JpGraph/JpGraph.php
@@ -18,6 +18,7 @@ static function module($moduleName){
             $path = __DIR__.'/src/jpgraph_'.$moduleName.'.php' ;
             if(file_exists($path)){
                 include_once $path ;
+                self::$modules[] = $moduleName;
             }else{
                 throw new ModuleNotFoundException('The JpGraphs\'s module "'.$moduleName.'" does not exist');
             }
@@ -25,4 +26,4 @@ static function module($moduleName){
     }
 }
 
-?>
\ No newline at end of file
+?>