diff --git a/src/caoscrawler/identifiable.py b/src/caoscrawler/identifiable.py
index 9a80a77478e87dfdf52a322503b73612e613cfd6..7ff7172576be08e068ba412f319b059fb349bbeb 100644
--- a/src/caoscrawler/identifiable.py
+++ b/src/caoscrawler/identifiable.py
@@ -102,7 +102,7 @@ class Identifiable():
     def _create_hashable_string(identifiable: Identifiable) -> str:
         """
         creates a string from the attributes of an identifiable that can be hashed
-        String has the form "P<parent>N<name>a:5b:10"
+        String has the form "P<parent>N<name>R<reference-ids>a:5b:10"
         """
         rec_string = "P<{}>N<{}>R<{}>".format(
             identifiable.record_type,