diff --git a/src/enums/MDTagRelationType.php b/src/enums/MDTagRelationType.php
index 57c5a25..fa72ddf 100644
--- a/src/enums/MDTagRelationType.php
+++ b/src/enums/MDTagRelationType.php
@@ -40,7 +40,7 @@ enum MDTagRelationType implements MDValueEnumInterface, JsonSerializable {
             'topic' => self::topic,
             'mentioned' => self::mentioned,
             'taxon' => self::taxon,
-            default => throw new MDpageParameterNotFromListException("Unknown tag relation type"),
+            default => throw new MDpageParameterNotFromListException("Unknown tag relation type: " . $input),
         };
 
     }