Update README.md

README.md

@@ -153,7 +153,7 @@ Once you finished [Initialisation](#41-initialisation) and [Configuration](#42-c
 ## number of CPU cores available for running the pipeline (for instance here 64 cores)
 N_CORES=64
 ## run the pipeline into a single command
-bash main.sh $CORES
+bash main.sh $N_CORES
 ```