diff --git a/CHANGELOG.md b/CHANGELOG.md
index 09055dd7..9cace690 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,16 @@ will consitute of a breaking change warranting a new major release:
   is not in normal mode.
 - MPSoC debug mode.
 
+## Changed
+
+- `Power Controller` now uses monotonic clock for calculating time difference
+- `ACS Controller` now uses monotonic clock for calculating time difference and the normal clock
+  for model calculations. The `timeDelta` is now calculated in the controller instead of
+  everywhere where it is needed.
+- `ACS Controller` now has the function `performAttitudeControl` which is called prior to passing
+  on to the relevant mode functions. It handles all telemetry relevant functions, which were
+  always called, regardless of the mode.
+
 # [v7.1.0] 2023-10-11
 
 - Bumped `eive-tmtc` to v5.8.0.