diff --git a/tox.ini b/tox.ini
index f8acabc..00a8961 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ deps =
     pytest
     pytest-cov
 commands =
-    py.test --basetemp={envtmpdir} --cov=cachetools {posargs}
+    py.test --basetemp={envtmpdir} --cov=cachetools --cov-report term-missing {posargs}
 
 [testenv:check-manifest]
 deps =