diff --git a/build/BerkeleyDB42.patch b/build/BerkeleyDB42.patch
index 9bfeb421b4..b3acf825b5 100644
--- a/build/BerkeleyDB42.patch
+++ b/build/BerkeleyDB42.patch
@@ -1,6 +1,14 @@
-This patch is intended to be applied to Berkeley DB 4.2 and,
+This patch is intended to be applied to Berkeley DB 4.2.52 and,
 if applied, will automatically be used by slapd(8) back-bdb/hdb.
 
+The patch can be applied using patch(1) as follows
+	cd db-4.2.52
+	patch < openldap-src/build/BerkeleyDB42.patch
+
+(modify directory paths as necessary).
+
+The patch should not be applied to Berkeley DB 4.3.
+
 
 Index: dbinc/db.in
 ===================================================================