Some index clarifications

doc/man/man5/slapd.conf.5

@@ -839,7 +839,10 @@ each database.  The default is
 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
@@ -857,7 +860,9 @@ may be specified to disallow use of this index by named subtypes.
 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