diff --git a/core/modules/system/src/Tests/Routing/RouterTest.php b/core/modules/system/src/Tests/Routing/RouterTest.php
index ce56a72..4abb283 100644
--- a/core/modules/system/src/Tests/Routing/RouterTest.php
+++ b/core/modules/system/src/Tests/Routing/RouterTest.php
@@ -211,7 +211,7 @@ public function testRouterMatching() {
   }
 
   /**
-   * Tests the route path case insensitivity
+   * Tests the route path case insensitivity.
    */
   public function testRoutePathMixedCase() {
     $this->drupalGet('router_test/TEST14/1');