diff --git a/Doc/c-api/gcsupport.rst b/Doc/c-api/gcsupport.rst
index b0a2d5c..9438fea 100644
--- a/Doc/c-api/gcsupport.rst
+++ b/Doc/c-api/gcsupport.rst
@@ -137,9 +137,10 @@
 
 .. c:function:: void Py_VISIT(PyObject *o)
 
-   Call the *visit* callback, with arguments *o* and *arg*. If *visit* returns
-   a non-zero value, then return it.  Using this macro, :c:member:`~PyTypeObject.tp_traverse`
-   handlers look like::
+   If *o* is not *NULL*, call the *visit* callback, with arguments *o*
+   and *arg*.  If *visit* returns a non-zero value, then return it.
+   Using this macro, :c:member:`~PyTypeObject.tp_traverse` handlers
+   look like::
 
       static int
       my_traverse(Noddy *self, visitproc visit, void *arg)