diff --git a/NEWS b/NEWS
index 4994614448..5b4dde3c5d 100644
--- a/NEWS
+++ b/NEWS
@@ -74,8 +74,7 @@ with all sufficient information, see the ChangeLog file.
   * Kernel
     * added method:
       * added Kernel#Hash conversion method like Array() or Float().
-      * added Kernel#__dir__ which returns the absolute path of the
-        directory of the file from which this method is called.
+      * added Kernel#__dir__, a shorthand for File.realdirpath(__FILE__).
       * added Kernel#caller_locations which returns an array of
         frame information objects.
     * extended method:
diff --git a/eval.c b/eval.c
index c4bda48524..622bfedf76 100644
--- a/eval.c
+++ b/eval.c
@@ -1508,7 +1508,7 @@ rb_f_callee_name(void)
  *  Returns the canonicalized absolute path of the directory of the file from
  *  which this method is called. It means symlinks in the path is resolved.
  *  If <code>__FILE__</code> is <code>nil</code>, it returns <code>nil</code>.
- *  The return value equals to <code>File.dirname(File.realpath(__FILE__))</code>.
+ *  The return value equals to <code>File.realdirpath(__FILE__)</code>.
  *
  */
 static VALUE