diff --git a/core/command/base.php b/core/command/base.php
index f36e00b6dbd4eaf3d9eecda5c24da41ee6265921..7dba2fde0104899652706b9fe514f8a5ed9d0b42 100644
--- a/core/command/base.php
+++ b/core/command/base.php
@@ -43,6 +43,7 @@ class Base extends Command {
 	 * @param InputInterface $input
 	 * @param OutputInterface $output
 	 * @param array $items
+	 * @param string $prefix
 	 */
 	protected function writeArrayInOutputFormat(InputInterface $input, OutputInterface $output, $items, $prefix = '  - ') {
 		switch ($input->getOption('output')) {