diff --git a/src/Document/Dictionary/DictionaryKey/DictionaryKey.php b/src/Document/Dictionary/DictionaryKey/DictionaryKey.php
index 5b22a8f..888760a 100644
--- a/src/Document/Dictionary/DictionaryKey/DictionaryKey.php
+++ b/src/Document/Dictionary/DictionaryKey/DictionaryKey.php
@@ -1052,7 +1052,7 @@ public function getValueTypes(): array {
             self::PC => [Dictionary::class, IntegerValue::class, ArrayValue::class],
             self::PDF => [TextStringValue::class],
             self::PDFDOC_ENCODING => [TextStringValue::class],
-            self::PERMS => [Dictionary::class],
+            self::PERMS => [Dictionary::class, TextStringValue::class],
             self::PI => [Dictionary::class],
             self::PICK_TRAY_BY_PDFSIZE => [BooleanValue::class],
             self::PID => [Dictionary::class],