diff --git a/apps/sharebymail/lib/ShareByMailProvider.php b/apps/sharebymail/lib/ShareByMailProvider.php
index 2484ccdd72..b82d54ba99 100644
--- a/apps/sharebymail/lib/ShareByMailProvider.php
+++ b/apps/sharebymail/lib/ShareByMailProvider.php
@@ -164,7 +164,7 @@ class ShareByMailProvider implements IShareProvider {
 		 */
 		$alreadyShared = $this->getSharedWith($shareWith, IShare::TYPE_EMAIL, $share->getNode(), 1, 0);
 		if (!empty($alreadyShared)) {
-			$message = 'Sharing %1$s failed, this item is already shared with %2$s';
+			$message = 'Sharing %1$s failed, because this item is already shared with user %2$s';
 			$message_t = $this->l->t('Sharing %1$s failed, this item is already shared with %2$s', [$share->getNode()->getName(), $shareWith]);
 			$this->logger->debug(sprintf($message, $share->getNode()->getName(), $shareWith), ['app' => 'Federated File Sharing']);
 			throw new \Exception($message_t);