Refactory2020.md

@@ -29,7 +29,7 @@ The refactory 2020 needs further work to be finished. Here is the task list:
 
 Running:
 ```find . -name "*.[h,cc]" | grep -v PROPOSAL | grep -v inexlib | grep -v build | grep -v ThirdParty```
-provides us with a complete list of files (133). Each one has to be checked, and migrated carefully:
+provides us with a complete list of files (133). Each one has to be checked, and migrated carefully. You can check with ```git diff -r  4d1baa1d ./Setup/SetupEnvironment.h``` what exactly changed in the period of interest. 
 
 - [ ] ./Stack/GeometryNodeStackExtension/GeometryNodeStackExtension.h
 - [ ] ./Stack/NuclearStackExtension/NuclearStackExtension.h