Doc/kernel-parameters.txt: mention modinfo and sysfs

Doc/kernel-parameters.txt: mention modinfo and sysfs
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

Documentation/kernel-parameters.txt

@@ -17,6 +17,13 @@ are specified on the kernel command line with the module name plus
 
 	usbcore.blinkenlights=1
 
+This document may not be entirely up to date and comprehensive. The command
+"modinfo -p ${modulename}" shows a current list of all parameters of a loadable
+module. Loadable modules, after being loaded into the running kernel, also
+reveal their parameters in /sys/module/${modulename}/parameters/. Some of these
+parameters may be changed at runtime by the command
+"echo -n ${value} > /sys/module/${modulename}/parameters/${parm}".
+
 The text in square brackets at the beginning of the description states the
 restrictions on the kernel for the said kernel parameter to be valid. The
 restrictions referred to are that the relevant option is valid if: