diff --git a/xdiff.php b/xdiff.php
index 6ee2ec0..1a77052 100644
--- a/xdiff.php
+++ b/xdiff.php
@@ -116,6 +116,7 @@ class xdiff
   /** Compute the differences between two arrays $array1 and $array2
     * @param array $array1 The first array to compare
     * @param array $array2 The second array to compare
+    * @return array The data in internal format
     */
   final public function computeArray ($array1, $array2)
   // {{{