diff --git a/.coveragerc b/.coveragerc
index 1f2be51..3342379 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -4,7 +4,7 @@ source = .
 
 omit =
   # TODO
-  app.py
+  dp_creator_ii/app/*
 
 # More strict: Check transitions between lines, not just individual lines.
 # TODO: branch = True
diff --git a/dp_creator_ii/__init__.py b/dp_creator_ii/__init__.py
index be09255..0a084e7 100644
--- a/dp_creator_ii/__init__.py
+++ b/dp_creator_ii/__init__.py
@@ -42,7 +42,7 @@ def main():  # pragma: no cover
 
     # Just setting variables in a plain python module doesn't work:
     # The new thread started for the server doesn't see changes.
-    Path("config.json").write_text(
+    Path("app/config.json").write_text(
         json.dumps(
             {
                 "csv_path": str(args.csv_path),
diff --git a/dp_creator_ii/app.py b/dp_creator_ii/app/__init__.py
similarity index 100%
rename from dp_creator_ii/app.py
rename to dp_creator_ii/app/__init__.py
diff --git a/dp_creator_ii/tests/test_app.py b/dp_creator_ii/tests/test_app.py
index ec1ea58..684af42 100644
--- a/dp_creator_ii/tests/test_app.py
+++ b/dp_creator_ii/tests/test_app.py
@@ -3,7 +3,7 @@
 from shiny.pytest import create_app_fixture
 
 
-app = create_app_fixture("../app.py")
+app = create_app_fixture("../app/__init__.py")
 
 
 # TODO: Why is incomplete coverage reported here?