(What Is a Function): `functionp' returns nil for special forms. Add an xref.

1 files changed, 3 insertions, 1 deletions

diff --git a/doc/lispref/functions.texi b/doc/lispref/functions.texi
index 3a891db871e..068d05ffc99 100644
--- a/doc/lispref/functions.texi
+++ b/doc/lispref/functions.texi
@@ -116,7 +116,9 @@ byte compiler.  @xref{Byte-Code Type}.
 
 @defun functionp object
 This function returns @code{t} if @var{object} is any kind of
-function, i.e. can be passed to @code{funcall}.
+function, i.e.@: can be passed to @code{funcall}.  Note that
+@code{functionp} returns @code{nil} for special forms (@pxref{Special
+Forms}).
 @end defun
 
 Unlike @code{functionp}, the next three functions do @emph{not}