diff --git a/src/MDConcSourceTypes.php b/src/MDConcSourceTypes.php
index c78f94c..e788c37 100644
--- a/src/MDConcSourceTypes.php
+++ b/src/MDConcSourceTypes.php
@@ -16,6 +16,7 @@ final class MDConcSourceTypes implements MDImporterConcordanceListInterface {
         // Book / default
         "buch" => "book",
         "literatur" => "book",
+        "document]book" => "book",
 
     ];