diff --git a/apps/dav/lib/Connector/Sabre/QuirksPlugin.php b/apps/dav/lib/Connector/Sabre/QuirksPlugin.php
index 5f546aa95729c..8a53a0eaffabd 100644
--- a/apps/dav/lib/Connector/Sabre/QuirksPlugin.php
+++ b/apps/dav/lib/Connector/Sabre/QuirksPlugin.php
@@ -29,18 +29,24 @@
 
 class QuirksPlugin extends ServerPlugin {
 
+	/** @var bool */
 	private $isMacOSDavAgent = false;
 
+	/** @psalm-var array{major: string, minor: string, patch: string}  */
 	private $macOSVersion;
 
+	/** @var string */
 	private $macOSAgent;
 
+	/** @psalm-var array{major: string, minor: null|string, patch: null|string} */
 	private $macOSAgentVersion;
 
 	/**
      * Sets up the plugin.
      *
      * This method is automatically called by the server class.
+	 *
+	 * @return void
      */
     public function initialize(Server $server)
     {
@@ -50,6 +56,8 @@ public function initialize(Server $server)
 
 	/**
      * Triggered before any method is handled.
+	 *
+	 * @return void
      */
     public function beforeMethod(RequestInterface $request, ResponseInterface $response)
     {
@@ -79,6 +87,8 @@ public function beforeMethod(RequestInterface $request, ResponseInterface $respo
      * @param string $reportName
      * @param mixed  $report
      * @param mixed  $path
+	 *
+	 * @return bool
      */
     public function report($reportName, $report, $path)
     {