diff --git a/sites/example.settings.local.php b/sites/example.settings.local.php
index 992b042..770750a 100644
--- a/sites/example.settings.local.php
+++ b/sites/example.settings.local.php
@@ -49,5 +49,8 @@
 
 /**
  * Do not exclude test extensions on extension discovery.
+ *
+ * This setting enables the inclusion of test extensions during the extension
+ * discovery; i.e. force discover of modules under the 'tests' directory.
  */
 $settings['extension_discovery_scan_tests'] = TRUE;