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-rw-r--r--ext/dbm/dbm.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/dbm/dbm.c b/ext/dbm/dbm.c
index 107818d..6413f3a 100644
--- a/ext/dbm/dbm.c
+++ b/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.
*/