message: Clarify that a job step/srun is required
diff: @@ -7,7 +7,8 @@ The resolution is done by determining job configuration through a number of Slur
  By default everything is determined from the Slurm environment, hence for most uses case no manual setting of parameters is required.
  ## How it works
  -Slurm sets a number of variables for each job and job step.
  +`SlurmClusterResolver` reads the environment variables that are set inside a job step launched by Slurm.
  +This means it will only work correctly for applications launched via `srun`.
  The process ID/rank is extracted from environment variable `SLURM_PROCID` and the total number of tasks launched is extracted from `SLURM_STEP_NUM_TASKS`.
  The hostnames are resolved by inspection `SLURM_STEP_NODELIST`.
  