diff --git a/src/Illuminate/Database/Schema/Grammars/Grammar.php b/src/Illuminate/Database/Schema/Grammars/Grammar.php
index fe597689c126..12a4b367146a 100755
--- a/src/Illuminate/Database/Schema/Grammars/Grammar.php
+++ b/src/Illuminate/Database/Schema/Grammars/Grammar.php
@@ -239,6 +239,8 @@ protected function typeComputed(Fluent $column)
      *
      * @param  \Illuminate\Support\Fluent  $column
      * @return string
+     *
+     * @throws \RuntimeException
      */
     protected function typeVector(Fluent $column)
     {