diff --git a/build/db.2.64.patch.README b/build/db.2.64.patch.README
index 5d70567bb9..5417244953 100644
--- a/build/db.2.64.patch.README
+++ b/build/db.2.64.patch.README
@@ -7,6 +7,9 @@ gcc 2.7.2.1, linux threads via libpthreads.so.1.60.4.
 THE BUG OCCURS ONLY WHEN SLAPD IS RUN WITH THREADS ENABLED AND MAY
 ONLY OCCUR ON THE PLATFORM SPECIFIED.
 
+SINCE THE CODE OF DB_OPEN() IS THE SAME IN VERSION 2.3.16 AND 2.6.4
+WITH REPECT TO THE BUG DETECTED, DB 2.3.16 SHOULD BE PATCHED AS WELL.
+
 Apply the supported patch at the root directory of Sleepycat´s code.
 Since the bug was reported to Sleepycat, it may not appear in DB
 versions, later than 2.6.4 beta.