diff --git a/README.md b/README.md
index 99dabaf..c2c7f2b 100644
--- a/README.md
+++ b/README.md
@@ -75,6 +75,7 @@ Package **opt** was written by [Charles Iliya Krempeaux](http://reiver.link)
 
 ## See Also
 
+* https://github.com/reiver/go-ftr — future types and promise types
 * https://github.com/reiver/go-lck — thread-safe locking types
 * https://github.com/reiver/go-nul — nullable optional types
 * https://github.com/reiver/go-opt — optional type