diff --git a/tox.ini b/tox.ini
index 0608693ba4e3d907ae405da6b9f7232ac52502ec..f35b894f38ac238693322ea0f6d62b4f17728284 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,4 +1,4 @@
-# Tox (http://tox.testrun.org/) is a tool for running tests
+# Tox (https://tox.readthedocs.io/) is a tool for running tests
 # in multiple virtualenvs. This configuration file will run the
 # test suite on all supported python versions. To use it, "pip install tox"
 # and then run "tox" from this directory.