updated README.md with information about the number of precesses when using mpirun

Author: ZocoLini

README.md

@@ -49,7 +49,7 @@ When running this software, there is a chance of generating an inf or NaN value.
 ```
 
 If the value of `p2` generated by the eSS solver is 0, the model eval produces an inf value. To avoid this, when the
-evaluation of the ODE generates a non-finite value, the software will set the value of the variable to 0. If you
+evaluation of the ODE generates a non-finite value, the software will set it to 0. If you
 want to change this behavior, you can set the value you want the variable to take when an invalid value is
 generated by setting the environment variable `CUQDYN_DEF_YDOT` to the desired value.
 
@@ -110,6 +110,9 @@ After this, the file `output/cuqdyn-results.txt` contains the results of the
 algorithm but reading it as a plain text is not very useful.
 To fix this, you can run: (Needs python3 and matplotlib installed)
 
+Note: Be carefull when executing with `mpirun`, the number of precesses must be divisor
+of m - 1, where m is the number of rows in the input data matrix.
+
 ```bash
 python3 plot.py output/cuqdyn-results.txt
 ```
@@ -129,11 +132,11 @@ Also, you can run
 ./build-{variant}/modules/cli/cli version
 ```
 
-to get the version of the cuqdyn-c lib and cli you are using.
+to get the version of the cuqdyn-c lib, sacess lib and cli you are using.
 
 ## Input files
 
-There are three types of input files needed to run the cli:
+There are three types of input files that must be provided:
 
 - **eSS Solver config xml:**
   This file contains the configuration of the eSS solver used in the sacess library.