Update README.md

Author: lorenzotomada

README.md

@@ -46,7 +46,7 @@ python scripts/mpi_running.py
 The previous command will run the script using as configuration file (containing, e.g., matrix size and number of processes) the file `experiments/config.yaml`.
 It is also possible to provide paths to other configuration files by passing the corresponding path through the `--config=path/to/file` command.
 
-Notice that the script is *not* called using `mpirun`, but internally it uses MPI.
+Notice that the script is *not* called using `mpirun`, but internally it uses `MPI`.
 This is done by spawning a communicator inside the script.
 
 In addition, in the `shell` folder, we provide a `submit.sbatch` file to run using `SLURM`, as well as a `submit.sh`.