Update README.md

Author: bobzhang

README.md

@@ -26,7 +26,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md).
 
 ## Acknowledgments
 
-* Thanks to the [OCaml](https://ocaml.org) team, obviously, without such a beautiful yet practical language, this backend would not exist
+* Thanks to the [OCaml](https://ocaml.org) team, obviously, without such a beautiful yet practical language, this project would not exist. The original type system was inherited from [it](jscomp/ml) with lots of modifications to fit with JS ecosystem better.
 * Thanks to [ninja-build](https://ninja-build.org), ReScript also comes with a blazing fast build tool on top of it, `ninja` is a truly [well engineered](http://aosabook.org/en/posa/ninja.html) scalable build tool
 * Thanks to [Bloomberg](https://www.techatbloomberg.com) and [Facebook](https://github.com/facebook/). This project began at Bloomberg and was published in 2016; without the support of Bloomberg, it would not have happened. This project's funded by Facebook since July 2017