diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7f1f275c..65e197a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,14 @@ will consitute of a breaking change warranting a new major release:
 
 # [unreleased]
 
+- `eive-tmtc`:
+
+## Added
+
+- SPG4 Propagator is now used for propagating the position of EIVE. It will only work once
+  a TLE has been uploaded with the newly added action command for the ACS Controller. In
+  return the actual GPS data will be ignored once SPG4 is running.
+
 ## Fixed
 - The handling function of the GPS data is only called once per GPS read. This should remove
   the fake fix-has-changed events.