typo

README.md

@@ -36,7 +36,7 @@ python mateRNAl.py -l 100 -g 0.3 -m 0.1 -t 2000 -n 5 -p 5
 You can start a simulation from a seed population of RNA sequences using the `--initial` option followed by the path to a sequence file. The file should have an RNA sequence on each line. An error will be thrown if sequences are of different lengths. If using `target` mode an error will be thrown if the size of the sequence does not match the size of the target structure.
 
 ```
-python mateRNAl.py --initial initial_pop.txt -t "....((((......((((...((((((.....))))))))))....))))"
+python mateRNAl.py --initial pop.txt -t "....((((......((((...((((((.....))))))))))....))))"
 ```
 
 Where `pop.txt` is a plaintext file containing one sequence per line.