Better docstring for null. (Bug#20815)

* src/data.c (null): Improves the docstring, saying what null returns
when OBJECT is non-nil.

diff --git a/src/data.c b/src/data.c
index 9b1c12a4b295668f38745e3424e59e304448fa7a..80f2ac9f90477664548243901f9971d9784e1f31 100644 (file)
--- a/src/data.c
+++ b/src/data.c
@@ -186,7 +186,7 @@ DEFUN ("eq", Feq, Seq, 2, 2, 0,
 }
 
 DEFUN ("null", Fnull, Snull, 1, 1, 0,
-       doc: /* Return t if OBJECT is nil.  */
+       doc: /* Return t if OBJECT is nil, and return nil otherwise.  */
        attributes: const)
   (Lisp_Object object)
 {