diff --git a/Classes/Indexer/NodeIndexingManager.php b/Classes/Indexer/NodeIndexingManager.php
index e3e9839..7c1d76a 100644
--- a/Classes/Indexer/NodeIndexingManager.php
+++ b/Classes/Indexer/NodeIndexingManager.php
@@ -79,7 +79,7 @@ public function injectSettings(array $settings)
      * @param Workspace $targetWorkspace In case this is triggered during publishing, a Workspace will be passed in
      * @return void
      */
-    public function indexNode(NodeInterface $node, Workspace $targetWorkspace = null)
+    public function indexNode(NodeInterface $node, $targetWorkspace = null)
     {
         // if this is triggered via afterNodePublishing, it could be a deletion, check and handle
         if ($node->isRemoved() && $targetWorkspace !== null && $targetWorkspace->getBaseWorkspace() === null) {
@@ -97,10 +97,10 @@ public function indexNode(NodeInterface $node, Workspace $targetWorkspace = null
      * Schedule a node for removal of the index
      *
      * @param NodeInterface $node
-     * @param Workspace $targetWorkspace In case this is triggered during publishing, a Workspace will be passed in
+     * @param mixed $targetWorkspace In case this is triggered during publishing, a Workspace will be passed in. Otherwise a signal information string can be found in the second argument.
      * @return void
      */
-    public function removeNode(NodeInterface $node, Workspace $targetWorkspace = null)
+    public function removeNode(NodeInterface $node, $targetWorkspace = null): void
     {
         $this->nodesToBeIndexed->detach($node);
         $this->nodesToBeRemoved->attach($node);