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diff --git a/manual/creature.texi b/manual/creature.texi
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@@ -85,6 +85,10 @@ BSD and SVID is also included.
If the macro @code{_XOPEN_SOURCE_EXTENDED} is also defined, even more
functionality is available. The extra functions will make all functions
available which are necessary for the X/Open Unix brand.
+
+If the macro @code{_XOPEN_SOURCE} has the value @math{500} this includes
+all functionality described so far plus some new definitions from the
+Single Unix specification, @w{version 2}.
@end defvr
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