diff --git a/lib/private/RichObjectStrings/Validator.php b/lib/private/RichObjectStrings/Validator.php
index 8b099047221..d1148940200 100644
--- a/lib/private/RichObjectStrings/Validator.php
+++ b/lib/private/RichObjectStrings/Validator.php
@@ -27,7 +27,7 @@ class Validator implements IValidator {
 
 	/**
 	 * @param string $subject
-	 * @param array<non-empty-string, array> $parameters
+	 * @param array<non-empty-string, array<non-empty-string, string>> $parameters
 	 * @throws InvalidObjectExeption
 	 * @since 11.0.0
 	 */
diff --git a/lib/public/RichObjectStrings/IValidator.php b/lib/public/RichObjectStrings/IValidator.php
index c97eda1aa80..a6c82d34259 100644
--- a/lib/public/RichObjectStrings/IValidator.php
+++ b/lib/public/RichObjectStrings/IValidator.php
@@ -22,7 +22,7 @@ interface IValidator {
 
 	/**
 	 * @param string $subject
-	 * @param array<non-empty-string, array> $parameters
+	 * @param array<non-empty-string, array<non-empty-string, string>> $parameters
 	 * @throws InvalidObjectExeption
 	 * @since 11.0.0
 	 */