diff --git a/library/Businessprocess/BpNode.php b/library/Businessprocess/BpNode.php
index bf15a115..15da7108 100644
--- a/library/Businessprocess/BpNode.php
+++ b/library/Businessprocess/BpNode.php
@@ -370,6 +370,11 @@ public function getAlias()
         return $this->alias ? preg_replace('~_~', ' ', $this->alias) : $this->name;
     }
 
+    /**
+     * Get the label of the node
+     *
+     * @return ?string
+     */
     public function getLabel()
     {
         return ($this->alias ?? $this->name)