1 files changed, 4 insertions, 4 deletions
diff --git a/internal/math.h b/internal/math.h
index 51d398f61e..08f852ffc1 100644
--- a/internal/math.h
+++ b/internal/math.h
@@ -1,14 +1,14 @@
-#ifndef INTERNAL_MATH_H /* -*- C -*- */
+#ifndef INTERNAL_MATH_H                                  /*-*-C-*-vi:se ft=c:*/
 #define INTERNAL_MATH_H
 /**
- * @file
- * @brief      Internal header for Math.
- * @author     \@shyouhei
+ * @author     Ruby developers <ruby-core@ruby-lang.org>
  * @copyright  This  file  is   a  part  of  the   programming  language  Ruby.
  *             Permission  is hereby  granted,  to  either redistribute  and/or
  *             modify this file, provided that  the conditions mentioned in the
  *             file COPYING are met.  Consult the file for details.
+ * @brief      Internal header for Math.
  */
+#include "ruby/ruby.h"          /* for VALUE */
 
 /* math.c */
 VALUE rb_math_atan2(VALUE, VALUE);