+It is useless in conjunction with the \fIslapd-ldap\fP and \fIslapd-meta\fP
+backends because they already exploit the libldap specific referral chase
+feature.
+[Note: this may change in the future, as the \fBldap\fP(5) and
+\fBmeta\fP(5) backends might no longer chase referrals on their own.]
+.TP
+.B chain-chaining [resolve=<r>] [continuation=<c>] [critical]
+This directive enables the \fIchaining\fP control
+(see \fIdraft-sermersheim-ldap-chaining\fP for details)
+with the desired resolve and continuation behaviors and criticality.
+The \fBresolve\fP parameter refers to the behavior while discovering
+a resource, namely when accessing the object indicated by the request DN;
+the \fBcontinuation\fP parameter refers to the behavior while handling
+intermediate responses, which is mostly significant for the search
+operation, but may affect extended operations that return intermediate
+responses.
+The values \fBr\fP and \fBc\fP can be any of
+.BR chainingPreferred ,
+.BR chainingRequired ,
+.BR referralsPreferred ,
+.BR referralsRequired .
+If the \fBcritical\fP flag affects the control criticality if provided.
+[This control is experimental and its support may change in the future.]
+.TP
+.B chain-cache-uri {FALSE|true}
+This directive instructs the \fIchain\fP overlay to cache
+connections to URIs parsed out of referrals that are not predefined,
+to be reused for later chaining.
+These URIs inherit the properties configured for the underlying
+\fBslapd-ldap\fP(5) before any occurrence of the \fBchain-uri\fP
+directive; in detail, they are essentially chained anonymously.