diff --git a/src/Negotiation/AcceptHeader.php b/src/Negotiation/AcceptHeader.php
index 3f5f8c5..0f63161 100644
--- a/src/Negotiation/AcceptHeader.php
+++ b/src/Negotiation/AcceptHeader.php
@@ -2,6 +2,17 @@
 
 namespace Negotiation;
 
+/**
+ * TODO: Add this methods in interface for next major version.
+ *
+ * @method string getNormalizedValue()
+ * @method string getValue()
+ * @method string getType()
+ * @method float getQuality()
+ * @method array<string, string> getParameters()
+ * @method string|null getParameter(string $key, string|null $default = null)
+ * @method bool hasParameter(string $key)
+ */
 interface AcceptHeader
 {
 }
diff --git a/src/Negotiation/BaseAccept.php b/src/Negotiation/BaseAccept.php
index a4663d2..7cc3908 100644
--- a/src/Negotiation/BaseAccept.php
+++ b/src/Negotiation/BaseAccept.php
@@ -20,7 +20,7 @@ abstract class BaseAccept
     private $value;
 
     /**
-     * @var array
+     * @var array<string, string>
      */
     private $parameters;
 
@@ -82,7 +82,7 @@ public function getQuality()
     }
 
     /**
-     * @return array
+     * @return array<string, string>
      */
     public function getParameters()
     {
@@ -90,10 +90,10 @@ public function getParameters()
     }
 
     /**
-     * @param string $key
-     * @param mixed  $default
+     * @param string      $key
+     * @param string|null $default
      *
-     * @return string|null
+     * @return string|null
      */
     public function getParameter($key, $default = null)
     {
@@ -103,7 +103,7 @@ public function getParameter($key, $default = null)
     /**
      * @param string $key
      *
-     * @return boolean
+     * @return bool
      */
     public function hasParameter($key)
     {
@@ -111,9 +111,9 @@ public function hasParameter($key)
     }
 
     /**
+     * @param string|null $acceptPart
      *
-     * @param  string|null $acceptPart
-     * @return array
+     * @return array{string, array<string, string>}
      */
     private function parseParameters($acceptPart)
     {
@@ -140,7 +140,7 @@ private function parseParameters($acceptPart)
     }
 
     /**
-     * @param string $parameters
+     * @param array<string, string> $parameters
      *
      * @return string
      */