index {<attrlist>|default} [pres,eq,approx,sub,<special>]
Specify the indexes to maintain for the given attribute. If only
an <attr> is given, the indices specified for \fBdefault\fR
-are maintained. A number of special index parameters may be
+are maintained. Note that setting a default does not imply that
+all attributes will be indexed.
+.LP
+A number of special index parameters may be
specified.
The index type
.B sub
The special type
.B autosubtypes
may be specified to automatically maintain separate indices for each
-named subtype of the attribute type.
+named subtype of the attribute type.
+Note: changing index settings requires rebuilding indices, see
+.BR slapindex (8).
.TP
.B mode <integer>
Specify the file protection mode that newly created database