diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 853a333..b55dbbc 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -4,6 +4,12 @@ Change Log
 
 This document records all notable changes to `fastcrc <https://github.com/overcat/fastcrc/>`_.
 
+0.2.1 (September 15, 2022)
+---------------------
+* feat: add `fastcrc.crc16.ibm_refin` and `cfastcrc.crc32.reversed_reciprocal_refin`, these are two experimental functions that may be removed in the future.
+* chore: build wheels for more platforms.
+* docs: improve documentation.
+
 0.2.0 (June 19, 2022)
 ---------------------
 * Add initial value optional parameter to all CRC functions. (`#1 <https://github.com/overcat/fastcrc/pull/1>`_)
diff --git a/Cargo.lock b/Cargo.lock
index a65d092..d576af0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -37,7 +37,7 @@ checksum = "2d0165d2900ae6778e36e80bbc4da3b5eefccee9ba939761f9c2882a5d9af3ff"
 
 [[package]]
 name = "fastcrc"
-version = "0.2.1-dev.8"
+version = "0.2.1"
 dependencies = [
  "crc",
  "paste 1.0.9",
diff --git a/Cargo.toml b/Cargo.toml
index 6cb54b7..a837da9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "fastcrc"
-version = "0.2.1-dev.8"
+version = "0.2.1"
 authors = ["overcat <4catcode@gmail.com>"]
 edition = "2018"
 description = "A hyper-fast Python module for computing CRC(16, 32, 64) checksum"
diff --git a/docs/requirements.txt b/docs/requirements.txt
index b608a07..8dfa28d 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,2 @@
-fastcrc==0.2.0
+fastcrc==0.2.1
 sphinx
\ No newline at end of file
diff --git a/fastcrc/__info__.py b/fastcrc/__info__.py
index e4f729a..0b1e230 100644
--- a/fastcrc/__info__.py
+++ b/fastcrc/__info__.py
@@ -2,7 +2,7 @@
 __description__ = "A hyper-fast Python module for computing CRC(16, 32, 64) checksum"
 __url__ = "https://github.com/overcat/fastcrc"
 __issues__ = f"{__url__}/issues"
-__version__ = "0.2.1-dev.8"
+__version__ = "0.2.1"
 __author__ = "overcat"
 __author_email__ = "4catcode@gmail.com"
 __license__ = "MIT License"
diff --git a/src/lib.rs b/src/lib.rs
index 60d442a..b1aadc7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -23,6 +23,7 @@ macro_rules! define_crc_fn {
                 let mut digest = match initial {
                     None => CRC.digest(),
                     Some(mut value) => {
+                        // TODO: This might be a bug in crc-rs, let's fix it later.
                         value ^= $crc_type.xorout;
                         if $crc_type.refout {
                             value = value.reverse_bits()