diff --git a/e2xgrader/exchange/submit.py b/e2xgrader/exchange/submit.py
index 664244d7..c6141673 100644
--- a/e2xgrader/exchange/submit.py
+++ b/e2xgrader/exchange/submit.py
@@ -19,7 +19,7 @@
 
 from nbgrader.exchange.default import ExchangeSubmit
 from nbgrader.utils import check_mode, get_username
-from traitlets import Type
+from traitlets import List, Type
 
 from ..exporters import SubmissionExporter
 from ..utils.mode import E2xGraderMode, infer_e2xgrader_mode
@@ -46,6 +46,15 @@ class E2xExchangeSubmit(E2xExchange, ExchangeSubmit):
         ),
     ).tag(config=True)
 
+    exclude_hashcode_subfolders = List(
+        [".ipynb_checkpoints", ".history"],
+        help=dedent(
+            """
+            List of subfolders to exclude from the hash calculation.
+            """
+        ),
+    ).tag(config=True)
+
     def init_dest(self):
         if self.coursedir.course_id == "":
             self.fail("No course id specified. Re-run with --course flag.")
@@ -148,7 +157,7 @@ def create_exam_files(self):
             self.src_path,
             method="sha1",
             exclude_files=[self.timestamp_file, f"{username}_info.txt", "*.html"],
-            exclude_subfolders=[".ipynb_checkpoints"],
+            exclude_subfolders=self.exclude_hashcode_subfolders,
             output_file="SHA1SUM.txt",
         )
         hashcode = truncate_hashcode(