diff --git a/src/Illuminate/Collections/Collection.php b/src/Illuminate/Collections/Collection.php
index 7a89f147a7b5..08a852fe19fa 100644
--- a/src/Illuminate/Collections/Collection.php
+++ b/src/Illuminate/Collections/Collection.php
@@ -740,7 +740,7 @@ public function containsOneItem(?callable $callback = null): bool
      *
      * @param  string  $glue
      * @param  string  $finalGlue
-     * @return string
+     * @return TValue|string
      */
     public function join($glue, $finalGlue = '')
     {