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diff --git a/manual/creature.texi b/manual/creature.texi
index 1efd1f5a7d..4cdcce99b0 100644
--- a/manual/creature.texi
+++ 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.