(defun font-lock-remove-keywords (mode keywords)
"Remove highlighting KEYWORDS for MODE.
-MODE should be a symbol, the major mode command name, such as `c-mode'
-or nil. If nil, highlighting keywords are removed for the current buffer.
+MODE should be a symbol, the major mode command name, such as
+`c-mode' or nil. If nil, highlighting keywords are removed for
+the current buffer.
+
+For a description of KEYWORDS, see `font-lock-add-keywords'.
To make the removal apply to modes derived from MODE as well,
pass nil for MODE and add the call to MODE-hook. This may fail