small rephrasing in the README

README.md

@@ -45,15 +45,14 @@ jupyter notebook 0_prepare_workload.ipynb
 ```
 
 ### 3. Launch the campaign
-Still inside the nix shell, launch the python script (it took around 2 hours for us to execute in parallel on our 16-core machine):
+Still inside the nix shell, launch the python script `campaign.py`. It will prepare and launch in parallel the 105 experiments. Each experiment corresponds to one instance of `instance.py`. 
 ```bash
 python3 campaign.py
 ```
+This step took around 2 hours for us to execute in parallel on our 16-core machine.
 
 ### 4. Analyse the results
 Finally and still in the nix shell, run this Jupyter notebook to plot the graphs displayed in the article (~15-20mn):
 ```bash
 jupyter notebook analyse_campaign.ipynb
-```
-
-
+```
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