1 files changed, 2 insertions, 0 deletions
diff --git a/tox.ini b/tox.ini
index 54a322a..129f9b4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,8 @@ envlist=py{27,34,35,36,37,38}-test,flake8,check_readme,py{27,37}-selfcheck
 
 [pytest]
 filterwarnings=error
+markers=
+    issue(id): reference to github issue
 
 [flake8]
 max-complexity = 10