diff --git a/lib/Service/IRecommendation.php b/lib/Service/IRecommendation.php
index 080fd600..8512fa16 100644
--- a/lib/Service/IRecommendation.php
+++ b/lib/Service/IRecommendation.php
@@ -24,4 +24,6 @@ public function hasPreview(): bool;
 	public function setHasPreview(bool $state);
 
 	public function getReason(): string;
+
+	public function getEtag(): string;
 }
diff --git a/lib/Service/RecommendedFile.php b/lib/Service/RecommendedFile.php
index c8c3d30b..980967b7 100644
--- a/lib/Service/RecommendedFile.php
+++ b/lib/Service/RecommendedFile.php
@@ -21,6 +21,7 @@ class RecommendedFile implements IRecommendation {
 	private int $timestamp;
 	private string $reason;
 	private bool $hasPreview;
+	private string $etag;
 
 	public function __construct(string $directory,
 		Node $node,
@@ -31,6 +32,7 @@ public function __construct(string $directory,
 		$this->reason = $reason;
 		$this->timestamp = $timestamp;
 		$this->hasPreview = false;
+		$this->etag = $node->getEtag();
 	}
 
 	public function getId(): string {
@@ -53,6 +55,10 @@ public function getReason(): string {
 		return $this->reason;
 	}
 
+	public function getEtag(): string {
+		return $this->etag;
+	}
+
 	public function hasPreview(): bool {
 		return $this->hasPreview;
 	}
@@ -75,6 +81,7 @@ public function jsonSerialize() {
 			'mimeType' => $this->node->getMimetype(),
 			'hasPreview' => $this->hasPreview(),
 			'reason' => $this->getReason(),
+			'etag' => $this->getEtag(),
 		];
 	}
 }