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-rw-r--r--manual/math.texi2
1 files changed, 2 insertions, 0 deletions
diff --git a/manual/math.texi b/manual/math.texi
index cc29cd6..9c0552d 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