diff --git a/README.md b/README.md
index 8dca221..98f6b79 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ This package for the [Laravel framework](https://laravel.com/) will make it easy
 
 Run this at the command line:
 ```php
-$ composer require tabuna/breadcrumbs
+composer require tabuna/breadcrumbs
 ```
 
 This will update `composer.json` and install the package into the `vendor/` directory.
diff --git a/src/Manager.php b/src/Manager.php
index 90e1493..fbcdb77 100644
--- a/src/Manager.php
+++ b/src/Manager.php
@@ -84,7 +84,7 @@ public function generate(string $route, $parameters = null): Collection
      *
      * @return bool
      */
-    public function has(string $name = null): bool
+    public function has(?string $name = null): bool
     {
         $name = $name ?? Route::currentRouteName();
 
diff --git a/src/Trail.php b/src/Trail.php
index 226f1be..515edde 100644
--- a/src/Trail.php
+++ b/src/Trail.php
@@ -148,7 +148,7 @@ public function parent(string $name, ...$parameters): self
      *
      * @return Trail
      */
-    public function push(string $title, string $url = null): self
+    public function push(string $title, ?string $url = null): self
     {
         $this->breadcrumbs->push(new Crumb($title, $url));