diff --git a/module/VuFind/src/VuFind/Config/Writer.php b/module/VuFind/src/VuFind/Config/Writer.php
index bb5da67b58f932d9ba263ef34fc6ffe1fc624fee..315a633bbbdb7a9f1dc17b15a68683cebac5bae7 100644
--- a/module/VuFind/src/VuFind/Config/Writer.php
+++ b/module/VuFind/src/VuFind/Config/Writer.php
@@ -38,7 +38,18 @@ namespace VuFind\Config;
  */
 class Writer
 {
+    /**
+     * Configuration file to write
+     *
+     * @var string
+     */
     protected $filename;
+
+    /**
+     * Content of file
+     *
+     * @var string
+     */
     protected $content;
 
     /**