diff --git a/.travis.yml b/.travis.yml
index 80a86be9..a4858707 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -58,7 +58,7 @@ jobs:
       python: 3.8
       # black is automatically installed by peotry
       script:
-        - black --check . --verbose
+        - black --check . --verbose --diff
 
     # Python 3.6 Tests
     - name: Python 3.6 on Linux