diff --git a/src/Composer/Config/JsonConfigSource.php b/src/Composer/Config/JsonConfigSource.php
index 4be155782..efede264e 100644
--- a/src/Composer/Config/JsonConfigSource.php
+++ b/src/Composer/Config/JsonConfigSource.php
@@ -206,6 +206,13 @@ class JsonConfigSource implements ConfigSourceInterface
         });
     }
 
+    /**
+     * @param string $method
+     * @param mixed ...$args
+     * @param callable $fallback
+     *
+     * @return void
+     */
     protected function manipulateJson($method, $args, $fallback)
     {
         $args = func_get_args();
@@ -290,7 +297,7 @@ class JsonConfigSource implements ConfigSourceInterface
     /**
      * Prepend a reference to an element to the beginning of an array.
      *
-     * @param  array $array
+     * @param  mixed[] $array
      * @param  mixed $value
      * @return int
      */