diff --git a/src/Analytics/Analytics.php b/src/Analytics/Analytics.php
index 3f30f5a..1d4b5a8 100644
--- a/src/Analytics/Analytics.php
+++ b/src/Analytics/Analytics.php
@@ -16,20 +16,24 @@
 
 abstract class Analytics
 {
-    protected $enabled = true;
+    protected bool $enabled = true;
 
     /**
      * Enables tracking for this instance.
+     * 
+     * @return void
      */
-    public function enable()
+    public function enable(): void
     {
         $this->enabled = true;
     }
 
     /**
      * Disables tracking for this instance.
+     * 
+     * @return void
      */
-    public function disable()
+    public function disable(): void
     {
         $this->enabled = false;
     }
@@ -40,8 +44,9 @@ public function disable()
      * 
      * @return string
      */
-    static public function getUniqueByHostname():string {
+    static public function getUniqueByHostname(): string
+    {
         $host = gethostname();
-        return md5(gethostbyname($host).$host);
+        return md5(gethostbyname($host) . $host);
     }
 }
diff --git a/src/Analytics/GoogleAnalytics.php b/src/Analytics/GoogleAnalytics.php
index b1b76e5..ba19275 100644
--- a/src/Analytics/GoogleAnalytics.php
+++ b/src/Analytics/GoogleAnalytics.php
@@ -51,7 +51,7 @@ public function __construct(string $tid, string $cid)
      * @param string $label
      * Specifies the event label.
      * 
-     * @param string $value
+     * @param null|int $value
      * Specifies the event value. Values must be non-negative.
      * 
      * @return bool
@@ -109,7 +109,7 @@ public function createPageView(string $hostname, string $page, string $title = n
         return true;
     }
 
-    private function execute(array $query)
+    private function execute(array $query): void
     {
         $ch = curl_init();
 
@@ -124,7 +124,7 @@ private function execute(array $query)
         curl_close($ch);
     }
 
-    private function prepareCurl(&$ch, array $query)
+    private function prepareCurl(&$ch, array $query): void
     {
         curl_setopt($ch, CURLOPT_URL, self::URL);
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);