diff --git a/src/MagicConstant.php b/src/MagicConstant.php
index aad3511..e15b79e 100644
--- a/src/MagicConstant.php
+++ b/src/MagicConstant.php
@@ -150,6 +150,10 @@ public function in(array $values): bool
         return false;
     }
 
+    /**
+     * @param string $format
+     * @return static
+     */
     public function toFormat(string $format): self
     {
         return new static($this->getValue($format));