diff --git a/xo-refcnt/include/xo/refcnt/Refcounted.hpp b/xo-refcnt/include/xo/refcnt/Refcounted.hpp
index bab9f1ba..13feed3d 100644
--- a/xo-refcnt/include/xo/refcnt/Refcounted.hpp
+++ b/xo-refcnt/include/xo/refcnt/Refcounted.hpp
@@ -13,11 +13,17 @@ namespace xo {
     namespace ref {
         template <typename T>
         class intrusive_ptr;
+
+        template <typename T>
+        class Borrow;
     }
 
     template <typename T>
     using rp = ref::intrusive_ptr<T>;
 
+    template <typename T>
+    using bp = ref::Borrow<T>;
+
     namespace ref {
         class Refcount;