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diff --git a/manual/creature.texi b/manual/creature.texi
index 61b17ce22b..257f8718b1 100644
--- a/manual/creature.texi
+++ b/manual/creature.texi
@@ -183,6 +183,15 @@ are enabled.  Only some of the features from this TS are supported by
 @end defvr
 
 @comment (none)
+@comment ISO
+@defvr Macro __STDC_WANT_IEC_60559_FUNCS_EXT__
+If you define this macro, features from ISO/IEC TS 18661-4:2015
+(Floating-point extensions for C: Supplementary functions) are
+enabled.  Only some of the features from this TS are supported by
+@theglibc{}.
+@end defvr
+
+@comment (none)
 @comment GNU
 @defvr Macro _GNU_SOURCE
 If you define this macro, everything is included: @w{ISO C89}, @w{ISO