diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7924c38..3d13839 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,15 +8,45 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [1.0.0] - 2025-1-30
 
 ### Added
-
 - All commands according to data sheet
-## [0.1.0] - 2021-2-1
+
+### Changed
+- You need to call scd4x_init(SCD41_I2C_ADDR_62); before sending any command
+- all methods that have been named xxxTicks are now named xxxRaw
+- getDataReadyFlag has been renamed to getDataReadyStatus
+- scd4x_get_automatic_self_calibration/scd4x_set_automatic_self_calibration has been renamed to scd4x_get_automatic_self_calibration_enabled/scd4x_set_automatic_self_calibration_enabled
+- signature of scd4x_get_serial_number has changed
+
+## [0.2.2] - 2021-04-30
+
+### Changed
+
+* Increase timing for single shot from 1350ms to 5000ms
+* Increase timing for self test from 5500ms to 10000ms
+
+
+## [0.2.1] - 2021-03-01
+
+### Fixed
+- Changelog links fixed.
+
+## [0.2.0] - 2021-03-01
 
 ### Added
+- Convenience interfaces taking care of unit conversion to and from ticks.
+
+### Fixed
+- wake-up interface handles missing ACK from sensor on wake up.
+
+
+## [0.1.0] - 2021-02-04
+
+Initial release
 
-- Initial version
-- Check latest 0.x.x version for changelog prior to version 1.0.0
 
 [Unreleased]: https://github.com/Sensirion/raspberry-pi-i2c-scd4x/compare/1.0.0...HEAD
-[1.0.0]: https://github.com/Sensirion/raspberry-pi-i2c-scd4x/compare/0.1.0...1.0.0
-[0.1.0]: https://github.com/Sensirion/raspberry-pi-i2c-scd4x/releases/tag/0.1.0
\ No newline at end of file
+[1.0.0]: https://github.com/Sensirion/raspberry-pi-i2c-scd4x/compare/0.2.2...1.0.0
+[0.2.2]: https://github.com/Sensirion/raspberry-pi-i2c-scd4x/compare/0.2.1...0.2.2
+[0.2.1]: https://github.com/Sensirion/raspberry-pi-i2c-scd4x/compare/0.2.0...0.2.1
+[0.2.0]: https://github.com/Sensirion/raspberry-pi-i2c-scd4x/compare/0.1.0...0.2.0
+[0.1.0]: https://github.com/Sensirion/raspberry-pi-i2c-scd4x/releases/tag/0.1.0