diff --git a/jsm.inc.php b/jsm.inc.php
index c3f9dc9..b6fee16 100644
--- a/jsm.inc.php
+++ b/jsm.inc.php
@@ -31,12 +31,12 @@ class JSM
     $this->args_parser = new JSM_ArgsParser();
   }
 
-  function getRootFile()
+  function getRootFile() : string
   {
     return $this->file;
   }
 
-  function getModule($file)
+  static function getModule($file) : JSM_Module
   {
     if(isset(self::$modules[$file]))
       return self::$modules[$file];
@@ -683,22 +683,23 @@ class JSM
 
 class JSM_Module
 {
-  var $file = '';
+  var string $file = '';
   var $defs = array();
+  //NOTE: all includes (even those included from other modules)
   var $includes = array();
   var $node = null;
 
-  function __construct($file)
+  function __construct(string $file)
   {
     $this->file = $file;
   }
  
-  function getIncludes()
+  function getIncludes() : array
   {
     return $this->includes;
   }
 
-  function getFile()
+  function getFile() : string 
   {
     return $this->file;
   }