diff --git a/systems/provided/dynamic_small_system_optimise/optimisation.py b/systems/provided/dynamic_small_system_optimise/optimisation.py
index 116ec39ae6..ee47405c84 100644
--- a/systems/provided/dynamic_small_system_optimise/optimisation.py
+++ b/systems/provided/dynamic_small_system_optimise/optimisation.py
@@ -270,6 +270,7 @@ def trade_shadow_cost(self):
         return self.speed_control.trade_shadow_cost
 
     def constraint_function_value(self, weights: np.array):
+        ## Function that will return a big number if constraints aren't satisfied
         if self.constraint_function == arg_not_supplied:
             return 0.0