diff --git a/doc/mp11/algorithm.adoc b/doc/mp11/algorithm.adoc
index 86158be..70477b5 100644
--- a/doc/mp11/algorithm.adoc
+++ b/doc/mp11/algorithm.adoc
@@ -661,13 +661,14 @@ As `mp_reverse_fold`, but takes a quoted metafunction.
 
 ## mp_unique_if<L, P>
 
-    template<class L> using mp_unique_if = /*...*/;
+    template<class L, template<class...> class P> using mp_unique_if = /*...*/;
 
-`mp_unique_if<L, P>` returns a list of the same form as `L` with the duplicate elements removed for which `mp_to_bool<P<T>>` is `mp_true`.
+As `mp_unique`, but two elements `T` and `U` are considered duplicates when `mp_to_bool<P<T, U>>` is `mp_true`.
 
-## mp_unique_if<L, Q>
+## mp_unique_if_q<L, Q>
 
-    template<class L, class Q> using mp_unique_if = mp_unique_if<L, Q::template fn>;
+    template<class L, class Q> using mp_unique_if_q =
+        mp_unique_if<L, Q::template fn>;
 
 As `mp_unique_if`, but takes a quoted metafunction.