akr	2011-11-10 20:39:16 +0900 (Thu, 10 Nov 2011)

  New Revision: 33700

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=33700

  Log:
    add comment.

  Modified files:
    trunk/ext/dbm/dbm.c

Index: ext/dbm/dbm.c
===================================================================
--- ext/dbm/dbm.c	(revision 33699)
+++ ext/dbm/dbm.c	(revision 33700)
@@ -186,6 +186,8 @@
      *       It doesn't provide dbm_pagfno() and dbm_dirfno().
      * 1992: 4.4BSD Alpha provides Berkeley DB with dbm_dirfno() as a function.
      *       dbm_pagfno() is a macro as DBM_PAGFNO_NOT_AVAILABLE.
+     * 1997: Berkeley DB 2.0 is released by Sleepycat Software, Inc.
+     *       It defines dbm_pagfno() and dbm_dirfno() as macros.
      * 2011: gdbm-1.9 creates a separate dir file.
      *       dbm_pagfno() and dbm_dirfno() returns different descriptors.
      */

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