--- a/src/doc/user/usermanual.sgml
+++ b/src/doc/user/usermanual.sgml
@@ -2034,9 +2034,12 @@
several values which will be OR'ed (the normal default for the
language is AND). Ex: <literal>mime:text/plain
mime:text/html</literal>. Specifying an explicit boolean
- operator or negation (<literal>-</literal>) before a
+ operator before a
<literal>mime</literal> specification is not supported and
- will produce strange results. Note that <literal>mime</literal> is
+ will produce strange results. You can filter out certain types
+ by using negation (<literal>-mime:some/type</literal>), and you can
+ use wildcards in the value (<literal>mime:text/*</literal>).
+ Note that <literal>mime</literal> is
the ONLY field with an OR default. You do need to use
<literal>OR</literal> with <literal>ext</literal> terms for
example.</para>