diff --git a/lib/private/Activity/Event.php b/lib/private/Activity/Event.php
index 97ab7d1c935..02cfd758058 100644
--- a/lib/private/Activity/Event.php
+++ b/lib/private/Activity/Event.php
@@ -259,7 +259,7 @@ class Event implements IEvent {
 	}
 
 	/**
-	 * @return array[]
+	 * @return array<string, array<string, string>>
 	 * @since 11.0.0
 	 */
 	public function getRichSubjectParameters(): array {
@@ -335,7 +335,7 @@ class Event implements IEvent {
 	}
 
 	/**
-	 * @return array[]
+	 * @return array<string, array<string, string>>
 	 * @since 11.0.0
 	 */
 	public function getRichMessageParameters(): array {
diff --git a/lib/public/Activity/IEvent.php b/lib/public/Activity/IEvent.php
index f204de599b9..eba426c5ecf 100644
--- a/lib/public/Activity/IEvent.php
+++ b/lib/public/Activity/IEvent.php
@@ -121,7 +121,7 @@ interface IEvent {
 	 * See https://github.com/nextcloud/server/issues/1706 for more information.
 	 *
 	 * @param string $subject
-	 * @param array $parameters
+	 * @param array<string, array<string, string>> $parameters
 	 * @return $this
 	 * @throws InvalidValueException if the subject or parameters are invalid
 	 * @since 11.0.0
@@ -136,7 +136,7 @@ interface IEvent {
 	public function getRichSubject(): string;
 
 	/**
-	 * @return array[]
+	 * @return array<string, array<string, string>>
 	 * @since 11.0.0
 	 */
 	public function getRichSubjectParameters(): array;
@@ -187,7 +187,7 @@ interface IEvent {
 	 * See https://github.com/nextcloud/server/issues/1706 for more information.
 	 *
 	 * @param string $message
-	 * @param array $parameters
+	 * @param array<string, array<string, string>> $parameters
 	 * @return $this
 	 * @throws \InvalidArgumentException if the message or parameters are invalid
 	 * @since 11.0.0
@@ -202,7 +202,7 @@ interface IEvent {
 	public function getRichMessage(): string;
 
 	/**
-	 * @return array[]
+	 * @return array<string, array<string, string>>
 	 * @since 11.0.0
 	 */
 	public function getRichMessageParameters(): array;