diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,7 @@ Differences Between DuMu<sup>x</sup> 3.8 and DuMu<sup>x</sup> 3.7
 - __Input file__: A string expression parser was added (implementation based on the ExprTK library which is shipped with DuMux). Using the new class `FunctionFromStringExpression<numArgs, ArgType>` functions based on string expression can parsed and evaluated. The most prominent use case is parsing functions
 from the parameter input file. The constructor takes the expression and an array of variable names to be replaced by function arguments. The function can then
 be evaluated with the function values provided in the same order as the names where specified. An arbitrary number of arguments is supported. ExprTK support very complex expressions, see https://www.partow.net/programming/exprtk/.
-- __Time loop__: Fixed a bug when the time is chosen to be negative and/or the end time is set to zero. (Before we assume time is always positive and endtime never zero.). Moreover, time loops can now be constructed from and time step sizes set with `std::chrono::durations`.
+- __Time loop__: Fixed a bug when the time is chosen to be negative and/or the end time is set to zero. (Before we assume time is always positive and endtime never zero.). Moreover, time loops can now be constructed from and time step sizes set with `std::chrono::duration`. Finally, the time loop now throws an exception when attempting to mix manual and periodic checkpoints as the implementation currently does not properly handle this case.
 - __Hyperelastic__: Added a hyperelastic model (large deformations) and a test (in geomechanics)
 - __Property system__: Added a function `inheritsFrom` that allows to query whether a type tag is present in the inheritance hierarchy of another type tag
 - __PDESolver__: The LinearPDESolver/NewtonSolver now has an `apply` method that returns a bool (true if converged) instead of throwing an exception