diff --git a/lib/public/TextProcessing/Exception/TaskFailureException.php b/lib/public/TextProcessing/Exception/TaskFailureException.php
index 5f7b308757b..300864711e7 100644
--- a/lib/public/TextProcessing/Exception/TaskFailureException.php
+++ b/lib/public/TextProcessing/Exception/TaskFailureException.php
@@ -2,6 +2,9 @@
 
 namespace OCP\TextProcessing\Exception;
 
+/**
+ * Exception thrown when a task failed
+ * @since 28.0.0
+ */
 class TaskFailureException extends \RuntimeException {
-
 }
diff --git a/lib/public/TextProcessing/Task.php b/lib/public/TextProcessing/Task.php
index 16850348358..f6b3a1a6a42 100644
--- a/lib/public/TextProcessing/Task.php
+++ b/lib/public/TextProcessing/Task.php
@@ -224,11 +224,20 @@ final class Task implements \JsonSerializable {
 		];
 	}
 
-final public function setCompletionExpectedAt(\DateTime $completionExpectedAt): void {
-	$this->completionExpectedAt = $completionExpectedAt;
-}
+	/**
+	 * @param null|\DateTime $completionExpectedAt
+	 * @return void
+	 * @since 28.0.0
+	 */
+	final public function setCompletionExpectedAt(?\DateTime $completionExpectedAt): void {
+		$this->completionExpectedAt = $completionExpectedAt;
+	}
 
-final public function getCompletionExpectedAt(): ?\DateTime {
-	return $this->completionExpectedAt;
-}
+	/**
+	 * @return \DateTime|null
+	 * @since 28.0.0
+	 */
+	final public function getCompletionExpectedAt(): ?\DateTime {
+		return $this->completionExpectedAt;
+	}
 }