1 files changed, 2 insertions, 1 deletions

diff --git a/doc/lispref/functions.texi b/doc/lispref/functions.texi
index 46073677881..9888411667f 100644
--- a/doc/lispref/functions.texi
+++ b/doc/lispref/functions.texi
@@ -1240,7 +1240,8 @@ buffer: if @var{place} is just a symbol, then @var{function} is added to the
 global value of @var{place}.  Whereas if @var{place} is of the form
 @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.
+current buffer.  Finally, if you want to modify a lexical variable, you will
+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