diff --git a/tests/README.md b/tests/README.md
index 14c9e95..a11a86a 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -7,5 +7,5 @@ composer create-project -s dev --prefer-source [--repository '{"type": "vcs", "u
 # Run tests
 
 ```
-./vendor/bin/phpunit [--no-coverage] [--coverage-html=cov]
+./vendor/bin/phpunit [--no-coverage] [--coverage-html coverage]
 ```