diff --git a/build/lib/pen_tracker/engine.py b/build/lib/pen_tracker/engine.py
index cfc6601..d3117c2 100644
--- a/build/lib/pen_tracker/engine.py
+++ b/build/lib/pen_tracker/engine.py
@@ -33,8 +33,13 @@ class Pen:
 class InkTracker:
     def __init__(self, storage_file: str = None):
         if storage_file is None:
-            storage_file = os.path.abspath('inks.csv')
-        self.storage_file = os.path.abspath(storage_file)
+            storage_file = os.getenv('INK_TRACKER_CSV')
+            if storage_file is None:
+                data_home = os.getenv('XDG_DATA_HOME', os.path.expanduser('~/.local/share'))
+                app_data_dir = os.path.join(data_home, 'pen-tracker')
+                os.makedirs(app_data_dir, exist_ok=True)
+                storage_file = os.path.join(app_data_dir, 'inks.csv')
+        self.storage_file = storage_file
         self.headers = ['Vendor', 'Name', 'Color', 'Purchased', 'Size', 'Notes']
         self.inks: List[Ink] = self.load_data()
 
diff --git a/pyproject.toml b/pyproject.toml
index 6c8f6e9..4167766 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pen-tracker"
-version = "0.4.0"
+version = "0.4.1"
 authors = [
   { name="Don Harper", email="don@donharper.org" },
 ]
diff --git a/src/pen_tracker.egg-info/PKG-INFO b/src/pen_tracker.egg-info/PKG-INFO
index 78eb99e..1446e53 100644
--- a/src/pen_tracker.egg-info/PKG-INFO
+++ b/src/pen_tracker.egg-info/PKG-INFO
@@ -1,6 +1,6 @@
 Metadata-Version: 2.4
 Name: pen-tracker
-Version: 0.4.0
+Version: 0.4.1
 Summary: A fountain pen collection tracker.
 Author-email: Don Harper <don@donharper.org>
 Requires-Python: >=3.8
diff --git a/src/pen_tracker/engine.py b/src/pen_tracker/engine.py
index cfc6601..d3117c2 100644
--- a/src/pen_tracker/engine.py
+++ b/src/pen_tracker/engine.py
@@ -33,8 +33,13 @@ class Pen:
 class InkTracker:
     def __init__(self, storage_file: str = None):
         if storage_file is None:
-            storage_file = os.path.abspath('inks.csv')
-        self.storage_file = os.path.abspath(storage_file)
+            storage_file = os.getenv('INK_TRACKER_CSV')
+            if storage_file is None:
+                data_home = os.getenv('XDG_DATA_HOME', os.path.expanduser('~/.local/share'))
+                app_data_dir = os.path.join(data_home, 'pen-tracker')
+                os.makedirs(app_data_dir, exist_ok=True)
+                storage_file = os.path.join(app_data_dir, 'inks.csv')
+        self.storage_file = storage_file
         self.headers = ['Vendor', 'Name', 'Color', 'Purchased', 'Size', 'Notes']
         self.inks: List[Ink] = self.load_data()