@code{(local @var{symbol})}, where @var{symbol} is an expression which returns
the variable name, then @var{function} will only be added in the
current buffer. Finally, if you want to modify a lexical variable, you will
-have to use @code{(var @var{VARIABLE})}.
+have to use @code{(var @var{variable})}.
Every function added with @code{add-function} can be accompanied by an
association list of properties @var{props}. Currently only two of those