Fix read me errors

README.md

@@ -31,17 +31,30 @@ test-dumper pflow
 
 What to do to run the TDD with r21 AODs
 ---------------------------------------
+
+Go to a new clean environment and run :
+
 ```bash
 setupATLAS
 git clone ssh://git@gitlab.cern.ch:7999/mfernoux/training-dataset-dumper.git
+source training-dataset-dumper/setup-athena.sh
 mkdir build
 cd build
 cmake ../training-dataset-dumper
 make
 source x*/setup.sh 
 cd ../training-dataset-dumper/BTagTrainingPreprocessing/bin / #where the ca-dump-upgrade file is
-./ ca-dump-upgrade -c ../../configs/single-b-tag/upgrade.json /AOD.root.
+./ ca-dump-upgrade -c ../../configs/single-b-tag/upgrade.json AOD.root.
+
+```
 
+Restoring the setup
+-------------------
+The next time you want to use the utility run from the project directory
+
+```
+source training-dataset-dumper/setup-athena.sh
+source build/x*/setup.sh
 ```
 
 Installation