diff --git a/CHANGELOG.md b/CHANGELOG.md
deleted file mode 100644
index 71242907a..000000000
--- a/CHANGELOG.md
+++ /dev/null
@@ -1,7 +0,0 @@
-## Unreleased
-
-### New features
-
-### Feature improvements
-
-### Fixes
diff --git a/HISTORY.rst b/HISTORY.rst
index 88e7e3f32..92308b874 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -1,6 +1,39 @@
 =======
 History
 =======
+
+0.3.0.dev2
+ — — — — — — — — -
+* DataPack version is still 0.0.2 (unstable)
+* Add a new tutorial for building machine translation system: #818, #826
+* Fix issues in documentation and tutorials: #825, #799, #830
+* Improve data augmentation: #784
+* Data-efficiency improvement: #834, #839, #692, #842
+
+0.3.0.dev1
+ — — — — — — — — -
+* Unstable development version
+* DataPack version is updated to 0.0.2 (unstable), does not support old data pack version.
+* Data-efficiency improvement
+   - Use new data structures such as list/tuples store the data in order to optimize the speed of operations such as add, query, get (type, range, attribute), delete, etc.
+#782, #796, #779, #801, #769, #771, #800, #680, #814
+* A prototyped Computer Vision design and example #795, #813
+* Regular bug fixes
+
+0.2.0
+ — — — — — — — — -
+* DataPack is newly versioned as 0.0.1, also supporting old (un-versioned) data pack versions
+* Add functionalities to data augmentation (#532, #536, #543, #554, #619, #685, #717)
+* Fix issues in examples and create some new ones (#545, #624, #529, #632, #708, #711)
+* Improve doctoring and refactor documentation (#611, #633, #636, #642, #652, #653, #657, #668, #674, #686, #682, #723, #730, #724)
+* Add audio support to DataPack (#585, #592, #600, #603, #609)
+* Improve and fix issues in ontology system (#568, #575, #577, #521)
+* Relax package requirements and move out dependencies (#705, #706, #707, #720, #760)
+* Add readers and selectors (#535, #516, #539)
+* Create some utilities for pipeline (#499, #690, #562)
+* Provide more operations for DataPack and MultiPack (#531, #534, #555, #564, #553, #576)
+* Several clean up and bug fixes (#541, #693, #695)
+
 0.1.2
  — — — — — — — — -
 * Simplify the Configurable interface (#517)
diff --git a/forte/data/multi_pack.py b/forte/data/multi_pack.py
index eb437b276..bea95df21 100644
--- a/forte/data/multi_pack.py
+++ b/forte/data/multi_pack.py
@@ -41,7 +41,7 @@
 )
 from forte.data.types import DataRequest
 from forte.utils import get_class, get_full_module_name
-from forte.version import DEFAULT_PACK_VERSION, PACK_ID_COMPATIBLE_VERSION
+from forte.version import DEFAULT_PACK_VERSION
 
 
 logger = logging.getLogger(__name__)
@@ -55,6 +55,10 @@
 
 MdRequest = Dict[Type[Union[MultiPackLink, MultiPackGroup]], Union[Dict, List]]
 
+# Before this, version, data packs are indexed in multipack using the index,
+# but afterwards, they are indexed by the pack id.
+version_indexed_by_pack_id = "0.0.1"
+
 
 class MultiPackMeta(BaseMeta):
     r"""Meta information of a MultiPack."""
@@ -149,19 +153,18 @@ def _init_meta(self, pack_name: Optional[str] = None) -> MultiPackMeta:
     def _validate(self, entry: EntryType) -> bool:
         return isinstance(entry, MultiPackEntries)
 
-    # TODO: get_subentry maybe useless
     def get_subentry(self, pack_idx: int, entry_id: int):
         r"""
-        Get sub_entry from multi pack. This method uses `pack_id` (a unique
-        identifier assigned to datapack) to get a pack from multi pack,
-        and then return its sub_entry with entry_id. Noted this is changed from
-        the way of accessing such pack before the PACK_ID_COMPATIBLE_VERSION,
+        Get `sub_entry` from `multi pack`. This method uses `pack_id` (a unique
+        identifier assigned to datapack) to get a pack from `multi pack`,
+        and then return its sub_entry with entry_id.
+
+        Noted this is changed from the way of accessing such pack before v0.0.1,
         in which the `pack_idx` was used as list index number to access/reference
-        a pack within the multi pack (and in this case then get the sub_entry).
+        a pack within the `multi pack` (and in this case then get the `sub_entry`).
 
         Args:
-            pack_idx: The pack_id for the data_pack in the
-              multi pack.
+            pack_idx: The pack_id for the data_pack in the multi pack.
             entry_id: the id for the entry from the pack with pack_id
 
         Returns:
@@ -171,7 +174,7 @@ def get_subentry(self, pack_idx: int, entry_id: int):
         pack_array_index: int = pack_idx  # the old way
         # the following check if the pack version is higher than the (backward)
         # compatible version in which pack_idx is the pack_id not list index
-        if Version(self.pack_version) >= Version(PACK_ID_COMPATIBLE_VERSION):
+        if Version(self.pack_version) >= Version(version_indexed_by_pack_id):
             pack_array_index = self.get_pack_index(
                 pack_idx
             )  # the new way: using pack_id instead of array index
diff --git a/forte/version.py b/forte/version.py
index 7cf4996ff..e0036f0b2 100644
--- a/forte/version.py
+++ b/forte/version.py
@@ -20,5 +20,7 @@
 VERSION = "{0}.{1}.{2}".format(_MAJOR, _MINOR, _REVISION)
 FORTE_IR_VERSION = "0.0.1"
 PACK_VERSION = "0.0.2"
+# The version before formal release, data pack without
+#  version annotation will be assigned this.
 DEFAULT_PACK_VERSION = "0.0.0"
 PACK_ID_COMPATIBLE_VERSION = "0.0.2"