(Writing Emacs Primitives): The interactive spec of a primitive can be

a Lisp form.

diff --git a/doc/lispref/internals.texi b/doc/lispref/internals.texi
index c977b2e549fc8d4a116b890b86da8c7792872aa0..75a4f49144d9829679029db2bf833d148cd28eb2 100644 (file)
--- a/doc/lispref/internals.texi
+++ b/doc/lispref/internals.texi
@@ -592,7 +592,8 @@ This is an interactive specification, a string such as might be used as
 the argument of @code{interactive} in a Lisp function.  In the case of
 @code{or}, it is 0 (a null pointer), indicating that @code{or} cannot be
 called interactively.  A value of @code{""} indicates a function that
-should receive no arguments when called interactively.
+should receive no arguments when called interactively.  If the value
+begins with a @samp{(}, the string is evaluated as a Lisp form.
 
 @item doc
 This is the documentation string.  It uses C comment syntax rather