diff --git a/README.md b/README.md
index ccc713b..c9142ed 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 
 [_catch22_](https://github.com/DynamicsAndNeuralSystems/catch22) is a collection of 22 time-series features coded in C that can be run from Python, as well as [R](https://github.com/hendersontrent/Rcatch22), [Matlab](https://github.com/DynamicsAndNeuralSystems/catch22), and [Julia](https://github.com/brendanjohnharris/Catch22.jl).
 
-This package provides a python implementation as the module _pycatch22_.
+This package provides a python implementation as the module _pycatch22_, licensed under the [GNU GPL v3 license](http://www.gnu.org/licenses/gpl-3.0.html) (or later).
 
 ### What do the features do?