diff --git a/Main assumptions b/Main assumptions
index 420cb1a..c9a8976 100644
--- a/Main assumptions	
+++ b/Main assumptions	
@@ -2,3 +2,4 @@ The emission factor (CO2) in NG pipelines is assigned as negative to the technol
 The capacity factors of the old thermal power plants are 5% less than the new corresponding power plants
 The old thermal power plants will generate at least 20% of their capacity until they are phased out of the system. This has been modelled using the TotalTechnologyAnnualActivityLowerLimit.
 The existing LNG terminals can not export more than their generation/capacity (the totalannualactivityuperlimit was used)
+XXREN= emission factor that was used to model the RET targets for each country. The annual emission limit for this factor is equal to 0. Where the emissionactivityratio has been set up in a way to capture the RET target between fossil fuels and renewables.