diff --git a/CHANGES.txt b/CHANGES.txt
index 0a8b277..25dc20c 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,11 +1,12 @@
 Feb 03, 2014 - Removed support for Python 2.6.  Added write support for
-    JP2 Palette and Component Mapping boxes, JPX Association and
-    NumberList boxes.  Added read support for JPX free, number list,
-    data reference, fragment table, and fragment list boxes.  Palette
-    box now a 2D numpy array instead of a list of 1D arrays.  JP2
-    super box constructors now take optional box list  argument.
-    Fixed bug where JPX files with more than one codestream but
-    advertising jp2 compatibility were not being read.
+    JP2 DataEntryURL, Palette and Component Mapping boxes, JPX
+    Association and NumberList boxes.  Added read support for JPX
+    free, number list, data reference, fragment table, and fragment
+    list boxes.  Palette box now a 2D numpy array instead of a list
+    of 1D arrays.  JP2 super box constructors now take optional box
+    list  argument.  Fixed bug where JPX files with more than one
+    codestream but advertising jp2 compatibility were not being
+    read.
 
 Jan 28, 2014 - v0.5.10  Fixed bad warning when reader requirements box mask
     length is unsupported.
diff --git a/glymur/jp2box.py b/glymur/jp2box.py
index ca1d973..47cfa30 100644
--- a/glymur/jp2box.py
+++ b/glymur/jp2box.py
@@ -2518,6 +2518,18 @@ class DataEntryURLBox(Jp2kBox):
         self.length = length
         self.offset = offset
 
+    def write(self, fptr):
+        """Write a data entry url box to file.
+        """
+        length = 8 + 1 + 3 + len(self.url.encode())
+        write_buffer = struct.pack('>I4sBBBB',
+                                   length, self.box_id.encode(),
+                                   self.version,
+                                   self.flag[0], self.flag[1], self.flag[2])
+        fptr.write(write_buffer)
+        fptr.write(self.url.encode())
+
+
     def __repr__(self):
         msg = "glymur.jp2box.DataEntryURLBox({0}, {1}, '{2}')"
         msg = msg.format(self.version, self.flag, self.url)
diff --git a/glymur/test/test_jp2box.py b/glymur/test/test_jp2box.py
index 0a3b24a..a4930a9 100644
--- a/glymur/test/test_jp2box.py
+++ b/glymur/test/test_jp2box.py
@@ -52,6 +52,34 @@ def load_tests(loader, tests, ignore):
     tests.addTests(doctest.DocTestSuite('glymur.jp2box'))
     return tests
 
+@unittest.skipIf(os.name == "nt", "Temporary file issue on window.")
+class TestDataEntryURL(unittest.TestCase):
+    """Test suite for DataEntryURL boxes."""
+    def setUp(self):
+        self.jp2file = glymur.data.nemo()
+
+    def test_basic_url(self):
+        """Just your most basic URL box."""
+        # Wrap our j2k file in a JP2 box along with an interior url box.
+        jp2 = Jp2k(self.jp2file)
+
+        url = 'http://glymur.readthedocs.org'
+        deurl = glymur.jp2box.DataEntryURLBox(0, (0, 0, 0), url)
+        boxes = [box for box in jp2.box if box.box_id != 'uuid']
+        boxes.append(deurl)
+        with tempfile.NamedTemporaryFile(suffix=".jp2") as tfile:
+            jp22 = jp2.wrap(tfile.name, boxes=boxes)
+            import shutil
+            shutil.copyfile(tfile.name, '/Users/jevans/a.jp2')
+
+        actdata = [box.box_id for box in jp22.box]
+        expdata = ['jP  ', 'ftyp', 'jp2h', 'jp2c', 'url ']
+        self.assertEqual(actdata, expdata)
+        self.assertEqual(jp22.box[4].version, 0)
+        self.assertEqual(jp22.box[4].flag, (0, 0, 0))
+        self.assertEqual(jp22.box[4].url, url)
+
+
 @unittest.skipIf(glymur.version.openjpeg_version_tuple[0] < 2 or
                  OPENJP2_IS_V2_OFFICIAL,
                  "Not supported until 2.0+.")