Update README.md

cellular_automaton/wireworld_c/README.md

@@ -67,7 +67,7 @@ Follow the compilation instructions given in the main directory of the kernel sa
 Assuming that the input file `primes.wi` is in your current working directory, to run the program you may use something similar to
 
 ```
-mpirun -n [nprocs] ./5_structured_wireworld_c primes
+mpirun -n [nprocs] ./5_structured_wireworld_c primes.wi
 ```
 
 either on the command line or in your batch script. Note that only the input file's basename (omitting the file extension) is passed to the program.
@@ -93,7 +93,7 @@ For large numbers as arguments to the option `-g`, the suffixes 'k' or 'M' may b
 If you run
 
 ```
-mpirun -n 12 ./5_structured_wireworld_c -i 10 -g 50k -v 2 --nprocs-x 3 primes
+mpirun -n 12 ./5_structured_wireworld_c -i 10 -g 50k -v 2 --nprocs-x 3 primes.wi
 ```
 
 the output should look similar to