diff --git a/pages/common/phpunit.md b/pages/common/phpunit.md
index f72df979a9..345769fb92 100644
--- a/pages/common/phpunit.md
+++ b/pages/common/phpunit.md
@@ -1,6 +1,7 @@
 # phpunit
 
 > PHPUnit command-line test runner.
+> More information: <https://phpunit.de>.
 
 - Run tests in the current directory. Note: Expects you to have a 'phpunit.xml':