akr	2012-02-12 01:28:13 +0900 (Sun, 12 Feb 2012)

  New Revision: 34561

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=34561

  Log:
    update doc.

  Modified files:
    trunk/time.c

Index: time.c
===================================================================
--- time.c	(revision 34560)
+++ time.c	(revision 34561)
@@ -4851,6 +4851,12 @@
  *  with each other -- times that are apparently equal when displayed may be
  *  different when compared.
  *
+ *  Current implemetation uses a signed 63 bit integer, Bignum or Rational.
+ *  The integer is a number of nanoseconds since the _Epoch_ which can
+ *  represent 1823-11-12 to 2116-02-20.
+ *  When Bignum or Rational is used (before 1823, after 2116, under nanosecond),
+ *  Time works slower than the integer is used.
+ *
  *  = Examples
  *
  *  All of these examples were done using the EST timezone which is GMT-5.

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