diff --git a/darwin/importer/importer.py b/darwin/importer/importer.py
index de7dade5b..69b015e63 100644
--- a/darwin/importer/importer.py
+++ b/darwin/importer/importer.py
@@ -2115,7 +2115,7 @@ def _display_slot_warnings_and_errors(
     Raises
     ------
     TypeError
-        If there are any warnings generated and the annotation format is not Darwin JSON 2.0
+        If there are any warnings generated and the annotation format is not Darwin JSON 2.0 or NifTI
     """
 
     # Warnings can only be generated by referring to slots, which is only supported by the Darwin JSON & NiFTI formats