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diff --git a/manual/threads.texi b/manual/threads.texi
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@@ -219,6 +219,9 @@ invoked from several threads. The completion of the function
@code{call_once} with the same @code{flag} variable.
@end deftypefun
+These definitions are from C11, where they appear in @file{threads.h}.
+In C23, they appear in @file{stdlib.h} as well as in @file{threads.h}.
+
@node ISO C Mutexes
@subsection Mutexes