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diff --git a/manual/creature.texi b/manual/creature.texi
index 1efd1f5a7d..4cdcce99b0 100644
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+++ b/manual/creature.texi
@@ -32,6 +32,7 @@ macro @code{_POSIX_C_SOURCE} to a positive integer.
@comment (none)
@comment POSIX.2
+@defvr Macro _POSIX_C_SOURCE
Define this macro to a positive integer to control which POSIX
functionality is made available. The greater the value of this macro,
the more functionality is made available.