man: detail modprobe.blacklist in kcmdline
diff --git a/man/modprobe.xml b/man/modprobe.xml
index 0b3b01d..e98e44e 100644
--- a/man/modprobe.xml
+++ b/man/modprobe.xml
@@ -86,7 +86,8 @@
         <refentrytitle>modprobe.conf</refentrytitle><manvolnum>5</manvolnum>
       </citerefentry>). <command>modprobe</command> will also use module
       options specified on the kernel command line in the form of
-      &lt;module&gt;.&lt;option&gt;.
+      &lt;module&gt;.&lt;option&gt; and blacklists in the form of
+      modprobe.blacklist=&lt;module&gt;.
     </para>
     <para>
       Note that unlike in 2.4 series Linux kernels (which are not supported