diff --git a/OCP/RichObjectStrings/IValidator.php b/OCP/RichObjectStrings/IValidator.php
index 122e5ca..255378a 100644
--- a/OCP/RichObjectStrings/IValidator.php
+++ b/OCP/RichObjectStrings/IValidator.php
@@ -11,6 +11,36 @@
 /**
  * Class Validator
  *
+ * @psalm-type RichObjectParameter = array{
+ *     type: string,
+ *     id: string,
+ *     name: string,
+ *     server?: string,
+ *     link?: string,
+ *     'call-type'?: 'one2one'|'group'|'public',
+ *     'icon-url'?: string,
+ *     'message-id'?: string,
+ *     boardname?: string,
+ *     stackname?: string,
+ *     size?: string,
+ *     path?: string,
+ *     mimetype?: string,
+ *     'preview-available'?: 'yes'|'no',
+ *     mtime?: string,
+ *     latitude?: string,
+ *     longitude?: string,
+ *     description?: string,
+ *     thumb?: string,
+ *     website?: string,
+ *     visibility?: '0'|'1',
+ *     assignable?: '0'|'1',
+ *     conversation?: string,
+ *     etag?: string,
+ *     permissions?: string,
+ *     width?: string,
+ *     height?: string,
+ * }
+ *
  * @since 11.0.0
  */
 interface IValidator {
@@ -22,7 +52,7 @@ interface IValidator {
 
 	/**
 	 * @param string $subject
-	 * @param array<non-empty-string, array<non-empty-string, string>> $parameters
+	 * @param array<non-empty-string, RichObjectParameter> $parameters
 	 * @throws InvalidObjectExeption
 	 * @since 11.0.0
 	 */