diff --git a/dan/datasets/extract/arkindex.py b/dan/datasets/extract/arkindex.py
index 02eefd1a8403ba9895d2f5878eaab86191bcfa4d..c91c5c2246e0f7702540ceeb58a20976aa338644 100644
--- a/dan/datasets/extract/arkindex.py
+++ b/dan/datasets/extract/arkindex.py
@@ -483,7 +483,7 @@ class ArkindexExtractor:
 
         if not self.data:
             raise Exception(
-                "No data was extracted using the provided export database and parameters"
+                "No data was extracted using the provided export database and parameters."
             )
 
         self.download_images()