added nexstrain ref to readme
@@ -168,6 +168,9 @@ There are several other tools which estimate molecular clock phylogenies.
* [Beast](http://beast.bio.ed.ac.uk/) relies on the MCMC-type sampling of trees. It is hence rather slow for large data sets. But BEAST allows the flexible inclusion of prior distributions, complex evolutionary models, and estimation of parameters.
* [Least-Square-Dating](http://www.atgc-montpellier.fr/LSD/) (LSD) emphasises speed (it scales as O(N) as **TreeTime**), but provides limited scope for customization.
+### Projects using treetime
+
+Treetime is an integral part of the [nextstrain.org](http://nextstrain.org) project to track and analyze viral sequence data in real time.
### Developer info
