diff --git a/changelog.yml b/changelog.yml
index d7e01e3..a755d32 100644
--- a/changelog.yml
+++ b/changelog.yml
@@ -1,6 +1,12 @@
 name: pyexcel-xls
 organisation: pyexcel
 releases:
+- changes:
+  - action: Updated
+    details:
+    - "`#47`: limit support to persist datetime.timedelta. see more details in doc"
+  date: tbd
+  version: 0.6.3
 - changes:
   - action: Updated
     details:
diff --git a/pyexcel-xls.yml b/pyexcel-xls.yml
index 4b55499..d8dbfef 100644
--- a/pyexcel-xls.yml
+++ b/pyexcel-xls.yml
@@ -2,8 +2,8 @@ overrides: "pyexcel.yaml"
 name: "pyexcel-xls"
 nick_name: xls
 version: 0.6.2
-current_version: 0.6.2
-release: 0.6.2
+current_version: 0.6.3
+release: 0.6.3
 file_type: xls
 is_on_conda: true
 dependencies:
diff --git a/pyexcel_xls/xlsw.py b/pyexcel_xls/xlsw.py
index 4822cd3..a127525 100644
--- a/pyexcel_xls/xlsw.py
+++ b/pyexcel_xls/xlsw.py
@@ -88,7 +88,7 @@ class XLSWriter(IWriter):
         _,  # file_type not used
         encoding="ascii",
         style_compression=2,
-        **keywords
+        **keywords,
     ):
         self.file_alike_object = file_alike_object
         self.work_book = Workbook(
diff --git a/tests/test_formatters.py b/tests/test_formatters.py
index a3c7518..750a60f 100644
--- a/tests/test_formatters.py
+++ b/tests/test_formatters.py
@@ -38,13 +38,13 @@ class TestDateFormat:
                 datetime.time(11, 11, 11),
                 datetime.datetime(2014, 12, 25, 11, 11, 11),
                 datetime.timedelta(
-                        days=50,
-                        seconds=27,
-                        microseconds=10,
-                        milliseconds=29000,
-                        minutes=5,
-                        hours=8,
-                        weeks=2,
+                    days=50,
+                    seconds=27,
+                    microseconds=10,
+                    milliseconds=29000,
+                    minutes=5,
+                    hours=8,
+                    weeks=2,
                 ),
             ]
         ]