-On input, only the limit on parameters per line restricts how many cmode
-parameters can be present. Apart from this, arbitrary modes shall be
-processed. Redundant modes may be dropped. For example, +n-n may be applied and
-propagated as +n-n, -n or (if the channel was already -n) nothing, but not as
-+n.
-
-The parameter for mode -k (removing a key) shall be ignored.
+The final parameter is a list of mode letters that may not be changed by local
+users. This applies to setting or unsetting simple modes, and changing or
+removing mode parameters.