diff --git a/src/enums/MDNodaRepository.php b/src/enums/MDNodaRepository.php
index c295cd1..3035ee0 100644
--- a/src/enums/MDNodaRepository.php
+++ b/src/enums/MDNodaRepository.php
@@ -60,6 +60,7 @@ enum MDNodaRepository implements MDValueEnumInterface, JsonSerializable {
             'cona'      => self::cona,
             'edition humboldt digital' => self::editionhumboldtdigital,
             'gnd'       => self::gnd,
+            'GND'       => self::gnd,
             'grobsystematik' => self::grobsystematik,
             'iconclass' => self::iconclass,
             'lcsh'      => self::lcsh,
@@ -83,7 +84,7 @@ enum MDNodaRepository implements MDValueEnumInterface, JsonSerializable {
             'viaf'      => self::viaf,
             'wikidata'  => self::wikidata,
             'Wikipedia'  => self::wikipedia,
-            default => throw new MDpageParameterNotFromListException("Unknown noda repository: " . $input),
+            default => throw new MDpageParameterNotFromListException("Unknown noda repository: '" . $input . "'"),
         };
 
     }