diff --git a/src/Files/ValueObjects/MimeType.php b/src/Files/ValueObjects/MimeType.php
index 2e3b8f1f..ac95deed 100644
--- a/src/Files/ValueObjects/MimeType.php
+++ b/src/Files/ValueObjects/MimeType.php
@@ -274,6 +274,7 @@ public function isDocument(): bool
      *
      * @param self|string $other The other MIME type to compare.
      * @return bool True if equal.
+     * @throws InvalidArgumentException If the other MIME type is invalid.
      */
     public function equals($other): bool
     {