diff --git a/doc/contributing.md b/doc/contributing.md
index a472f657a7..47e1fa3dd6 100644
--- a/doc/contributing.md
+++ b/doc/contributing.md
@@ -137,9 +137,9 @@ You can run the tests with
 which will run a good subset of tests. Some tests may fail. If you
 only want to see the output of failing tests, go for
 
-```cmd
+  ```cmd
   ./koch tests --failing all
-```
+  ```
 
 You can also run only a single category of tests. A category is a subdirectory
 in the ``tests/`` directory. There are a couple of special categories; for a