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-rw-r--r--ext/dbm/dbm.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/ext/dbm/dbm.c b/ext/dbm/dbm.c
index 83db7cb187..6cfd3743fa 100644
--- a/ext/dbm/dbm.c
+++ b/ext/dbm/dbm.c
@@ -961,10 +961,12 @@ fdbm_reject(VALUE obj)
* The exact library used depends on how Ruby was compiled. It could be any
* of the following:
*
+ * - The original ndbm is released in 4.3BSD.
+ * It is based on dbm in Unix Version 7 but has different API.
* - {Berkeley DB}[http://en.wikipedia.org/wiki/Berkeley_DB] versions
* 1 thru 5, also known as BDB and Sleepycat DB, now owned by Oracle
* Corporation.
- * - ndbm, aka Berkeley DB 1.x, still found in FreeBSD and OpenBSD.
+ * - Berkeley DB 1.x, still found in FreeBSD and OpenBSD.
* - {gdbm}[http://www.gnu.org/software/gdbm/], the GNU implementation of dbm.
* - {qdbm}[http://fallabs.com/qdbm/index.html], another open source
* reimplementation of dbm.