diff --git a/reference/ldap/setup.xml b/reference/ldap/setup.xml
index 38072c6423..97b1dbe5fe 100644
--- a/reference/ldap/setup.xml
+++ b/reference/ldap/setup.xml
@@ -12,6 +12,7 @@
    <link xlink:href="&url.ldap.openldap.source;">OpenLDAP</link> or <link
    xlink:href="&url.ldap.bind9;">Bind9.net</link> in order to compile PHP with
    LDAP support.
+   For PHP 5.6 or newer you will need OpenLDAP 2.4 or newer.
 <!--
 FIXME:
    The other links are dead.. (7/7/2005)