diff --git a/src/Money.php b/src/Money.php
index <HASH>..<HASH> 100644
--- a/src/Money.php
+++ b/src/Money.php
@@ -354,6 +354,8 @@ final class Money implements JsonSerializable
 
     /**
      * @throws InvalidArgumentException if the given $money is zero.
+     *
+     * @psalm-return numeric-string
      */
     public function ratioOf(Money $money): string
     {
Missing numeric-string type in ratioOf