diff --git a/src/NodaBlacklistedTerms.php b/src/NodaBlacklistedTerms.php
index b38da5a..386f5f6 100644
--- a/src/NodaBlacklistedTerms.php
+++ b/src/NodaBlacklistedTerms.php
@@ -13,7 +13,7 @@ final class NodaBlacklistedTerms {
     /**
      * A blacklist of disallowed tags. All entries are listed in full lowercase.
      */
-    const TAG_BLACKLIST = [
+    public const TAG_BLACKLIST = [
         'de' => [
             'andere',
             'anderes',
@@ -34,16 +34,23 @@ final class NodaBlacklistedTerms {
             'dinge',
             'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
             'nichtmünzliches',
+            'unbestimmt',
+            '-',
+            '?',
         ],
         'en' => [
             'other',
             'others',
             'unknown',
             'various',
+            '-',
+            '?',
         ],
         'hu' => [
             'ism.',
             'ismeretlen',
+            '-',
+            '?',
         ],
     ];