diff --git a/docs/conf.py b/docs/conf.py
index ad8521a..1b8a0f5 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -17,8 +17,8 @@
 copyright = '2016, the beets project'
 author = 'the beets project'
 
-version = '0.3'
-release = '0.3.0'
+version = '0.4'
+release = '0.4.0'
 
 pygments_style = 'sphinx'
 htmlhelp_basename = 'mediafiledoc'
diff --git a/docs/index.rst b/docs/index.rst
index 2b1dcab..4cb11c3 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -100,6 +100,11 @@ Internals
 Changelog
 ---------
 
+v0.4.0
+''''''
+
+- Added a ``barcode`` field.
+
 v0.3.0
 ''''''
 
diff --git a/mediafile.py b/mediafile.py
index 4ac373a..51f352a 100644
--- a/mediafile.py
+++ b/mediafile.py
@@ -1792,6 +1792,12 @@ def update(self, dict):
         StorageStyle('CATALOGNUMBER'),
         ASFStorageStyle('WM/CatalogNo'),
     )
+    barcode = MediaField(
+        MP3DescStorageStyle(u'BARCODE'),
+        MP4StorageStyle('----:com.apple.iTunes:BARCODE'),
+        StorageStyle('BARCODE'),
+        ASFStorageStyle('WM/Barcode'),
+    )
     disctitle = MediaField(
         MP3StorageStyle('TSST'),
         MP4StorageStyle('----:com.apple.iTunes:DISCSUBTITLE'),
diff --git a/setup.py b/setup.py
index 1ec4f9b..90e3aa6 100755
--- a/setup.py
+++ b/setup.py
@@ -84,7 +84,7 @@ def _read(filename):
 
 setup(
     name='mediafile',
-    version='0.3.0',
+    version='0.4.0',
     description='low-level audio tag interface',
     author='Adrian Sampson',
     author_email='adrian@radbox.org',
diff --git a/test/test_mediafile.py b/test/test_mediafile.py
index a961784..e9e1850 100644
--- a/test/test_mediafile.py
+++ b/test/test_mediafile.py
@@ -388,6 +388,7 @@ class ReadWriteTestBase(ArtTestMixin, GenreListTestMixin,
         'mb_releasegroupid',
         'asin',
         'catalognum',
+        'barcode',
         'disctitle',
         'script',
         'language',