diff --git a/src/ApiRouteSpec.php b/src/ApiRouteSpec.php
index f327685..49f0652 100644
--- a/src/ApiRouteSpec.php
+++ b/src/ApiRouteSpec.php
@@ -17,7 +17,7 @@ abstract class ApiRouteSpec
 {
 
 	/**
-	 * @var string
+	 * @var string|null
 	 */
 	protected $description;
 
@@ -99,13 +99,13 @@ public function __construct(array $data)
 	}
 
 
-	public function setDescription(string $description): void
+	public function setDescription(?string $description): void
 	{
 		$this->description = $description;
 	}
 
 
-	public function getDescription(): string
+	public function getDescription(): ?string
 	{
 		return $this->description;
 	}