diff --git a/reference/dba/constants.xml b/reference/dba/constants.xml
index 149844989081..988b11290420 100644
--- a/reference/dba/constants.xml
+++ b/reference/dba/constants.xml
@@ -1,11 +1,35 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-
 <appendix xml:id="dba.constants" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  &reftitle.constants;
- &no.constants;
+ &extension.constants;
+ <variablelist>
+  <varlistentry xml:id="constant.dba-lmdb-use-sub-dir">
+   <term>
+    <constant>DBA_LMDB_USE_SUB_DIR</constant>
+    (<type>int</type>)
+   </term>
+   <listitem>
+    <para>
+     LMDB Driver flag to allow the creation of a subdirectory for the database files.
+     Available as of PHP 8.2.0.
+    </para>
+   </listitem>
+  </varlistentry>
+  <varlistentry xml:id="constant.dba-lmdb-no-sub-dir">
+   <term>
+    <constant>DBA_LMDB_NO_SUB_DIR</constant>
+    (<type>int</type>)
+   </term>
+   <listitem>
+    <para>
+     LMDB Driver flag to disallow the creation of a subdirectory for the database files.
+     Available as of PHP 8.2.0.
+    </para>
+   </listitem>
+  </varlistentry>
+ </variablelist>
 </appendix>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml