diff --git a/library/Icinga/Cli/Documentation/CommentParser.php b/library/Icinga/Cli/Documentation/CommentParser.php
index 41048489707..f692fd528d9 100644
--- a/library/Icinga/Cli/Documentation/CommentParser.php
+++ b/library/Icinga/Cli/Documentation/CommentParser.php
@@ -37,6 +37,7 @@ protected function parse()
         $p = null;
         foreach (preg_split('~\n~', $plain) as $line) {
             // Strip * at line start
+            /** @var string $line */
             $line = preg_replace('~^\s*\*\s?~', '', $line);
             $line = rtrim($line);
             if ($this->title === null) {