diff --git a/modules/saml/lib/Auth/Source/SP.php b/modules/saml/lib/Auth/Source/SP.php
index 03d67f327ce454b2e010d4c45360baf9c32233d1..7664481f5c3470b53484b9848f6b7366fc3e7b23 100644
--- a/modules/saml/lib/Auth/Source/SP.php
+++ b/modules/saml/lib/Auth/Source/SP.php
@@ -60,7 +60,7 @@ class SP extends \SimpleSAML\Auth\Source
     /**
      * A list of supported protocols.
      *
-     * @var array
+     * @var string[]
      */
     private $protocols = [];