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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33700 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/dbm/dbm.c

@@ -186,6 +186,8 @@ fdbm_initialize(int argc, VALUE *argv, VALUE obj)
      *       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.
      */