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diff --git a/manual/math.texi b/manual/math.texi
index cc29cd6101..9c0552d2ff 100644
--- a/manual/math.texi
+++ b/manual/math.texi
@@ -1406,6 +1406,8 @@ a previous call to @var{initstate} or @var{setstate}.
 The return value is the previous value of the state information array.
 You can use this value later as an argument to @code{setstate} to
 restore that state.
+
+If the function fails the return value is @code{NULL}.
 @end deftypefun
 
 @node SVID Random