diff --git a/docs/opensource-users.md b/docs/opensource-users.md
index 1561db40..f830f009 100644
--- a/docs/opensource-users.md
+++ b/docs/opensource-users.md
@@ -1,4 +1,4 @@
-# A selection of Open Source projects using Catch
+# Open Source projects using Catch
 
 Catch is great for open source. With it's [liberal license](../LICENSE_1_0.txt) and single-header, dependency-free, distribution 
 it's easy to just drop the header into your project and start writing tests - what's not to like?
@@ -17,6 +17,9 @@ just let us know via any of the previously mentioned means - although I'm sure t
 ### [JSON for Modern C++](https://github.com/nlohmann/json)
 A, single-header, JSON parsing library that takes advantage of what C++ has to offer.
 
+### [Reactive-Extensions/ RxCpp](https://github.com/Reactive-Extensions/RxCpp)
+A library of algorithms for values-distributed-in-time
+
 ## Applications & Tools
 
 ### [Standardese](https://github.com/foonathan/standardese)
@@ -24,4 +27,4 @@ Standardese aims to be a nextgen Doxygen
 
 ---
 
-[Home](Readme.md)
\ No newline at end of file
+[Home](Readme.md)