diff --git a/doc/mp11/set.adoc b/doc/mp11/set.adoc
index 65b36ce..a7d1191 100644
--- a/doc/mp11/set.adoc
+++ b/doc/mp11/set.adoc
@@ -43,5 +43,19 @@ For each `T1` in `T...`, `mp_set_push_back<S, T...>` appends `T1` to the end of
 
     template<class... L> using mp_set_union = /*...*/;
 
-`mp_set_union<S, L...>` is `mp_set_push_back<S, T...>`, where `T...` are the elements of `mp_append<mp_list<>, L...>`.
+`mp_set_union<S, L...>` is `mp_set_push_back<S, T...>`, where `T...` are the combined elements of the lists `L...`.
 `mp_set_union<>` is `mp_list<>`.
+
+## mp_set_intersection<S...>
+
+    template<class... S> using mp_set_intersection = /*...*/;
+
+`mp_set_intersection<S...>` returns a set that contains the elements that occur in all of the sets `S...`.
+`mp_set_intersection<>` is `mp_list<>`.
+
+## mp_set_difference<L, S...>
+
+    template<class L, class... S> using mp_set_difference = /*...*/;
+
+`mp_set_difference<L, S...>` removes the elements of the list `L` that appear in any of the sets `S...` and
+returns the result.