diff --git a/basis/math/intervals/intervals-docs.factor b/basis/math/intervals/intervals-docs.factor
index 4be8dcc9a7..0c0f95b48c 100644
--- a/basis/math/intervals/intervals-docs.factor
+++ b/basis/math/intervals/intervals-docs.factor
@@ -253,7 +253,7 @@ HELP: interval-bitnot
 { $description "Computes the bitwise complement of the interval." } ;
 
 HELP: points>interval
-{ $values { "seq" "a sequence of " { $snippet "{ point included? }" } " pairs" } { "interval" interval } }
+{ $values { "seq" "a sequence of " { $snippet "{ point included? }" } " pairs" } { "interval" interval } { "nan?" "true if the computation produced NaNs" } }
 { $description "Outputs the smallest interval containing all of the endpoints." }
 ;