diff --git a/Doc/api/concrete.tex b/Doc/api/concrete.tex
index 93a7bd2..03f77b6 100644
--- a/Doc/api/concrete.tex
+++ b/Doc/api/concrete.tex
@@ -2409,7 +2409,7 @@
 
 \begin{cfuncdesc}{PyObject*}{PyWeakref_GetObject}{PyObject *ref}
   Returns the referenced object from a weak reference, \var{ref}.  If
-  the referent is no longer live, returns \NULL.
+  the referent is no longer live, returns \code{None}.
   \versionadded{2.2}
 \end{cfuncdesc}