diff --git a/R/netsim_scenarios.R b/R/netsim_scenarios.R
index 64531cd..778d484 100644
--- a/R/netsim_scenarios.R
+++ b/R/netsim_scenarios.R
@@ -3,6 +3,10 @@
 #' This step template is similar to `netsim_scenarios` but for the HPC. It uses
 #' `slurmworkflow::step_tmpl_map` internally and should be used as any
 #' `slurmworkflow` step. For details, see `netsim_scenarios` documentation.
+#' The inner parallelization is by default handled with
+#' `future::plan("multicore", workers = n_cores)`.
+#' Using `control$future.use.plan <- future::tweaked(<your plan>)` will bypass
+#' this setting.
 #'
 #' @inheritParams slurmworkflow::step_tmpl_map
 #' @inheritParams netsim_scenarios
@@ -17,6 +21,13 @@ step_tmpl_netsim_scenarios <- function(path_to_x, param, init, control,
                                        output_dir, libraries = NULL,
                                        setup_lines = NULL,
                                        max_array_size = NULL, ...) {
+
+  # Set a `multicore` plan with `n_cores` workers by default.
+  # Bypassed if `control$future.use.plan` is manually set
+  if (!inherits(control$future.use.plan, c("tweaked", "future"))) {
+    control$future.use.plan <- future::tweak("multicore", workers = n_cores)
+  }
+
   p_list <- netsim_scenarios_setup(
     path_to_x, param, init, control,
     scenarios_list, n_rep, n_cores,
@@ -95,6 +106,14 @@ netsim_scenarios_setup <- function(path_to_x, param, init, control,
   batchs_list <- rep(seq_len(n_batch), length(scenarios_list))
   scenarios_list <- rep(scenarios_list, each = n_batch)
 
+  if (isTRUE(control$future.use.plan)) {
+    stop(
+      "`netsim_scenarios` do not accept `control$future.use.plan == TRUE`.\n",
+      "use `control$future.use.plan = future::tweak(<your plan>)` \n",
+      " to setup a custom ."
+    )
+  }
+
   list(
     scenarios_list = scenarios_list,
     batchs_list = batchs_list,
@@ -430,4 +449,4 @@ get_scenarios_tibble_infos <- function(scenario_dir) {
     file_path = file_name_list,
     scenario_name = parts[, "scenario"]
   )
-}
\ No newline at end of file
+}
diff --git a/man/step_tmpl_netsim_scenarios.Rd b/man/step_tmpl_netsim_scenarios.Rd
index 6ffebcc..2d5790f 100644
--- a/man/step_tmpl_netsim_scenarios.Rd
+++ b/man/step_tmpl_netsim_scenarios.Rd
@@ -45,9 +45,11 @@ required for the model to run. (e.g. EpiModelHIV or EpiModelCOVID)}
 \item{setup_lines}{(optional) a vector of bash lines to be run first.
 This can be used to load the required modules (like R, python, etc).}
 
-\item{max_array_size}{maximum number of array jobs to be submitted at the
-same time. Should be strictly less than the maximum number of jobs you are
-allowed to submit to slurm on your HPC.}
+\item{max_array_size}{maximum number of array jobs to be submitted at once.
+It should be strictly less than the maximum number of jobs you are allowed
+to submit to \code{slurm} on your HPC. If the number of jobs is greater than
+\code{max_array_size}, they will be submitted in multiple batches. The
+submission of the next batch is automatically handled by \code{slurmworkflow}.}
 
 \item{...}{arguments to vectorize over (vectors or lists of strictly
 positive length, or all of zero length).  See also ‘Details’.}
@@ -59,6 +61,10 @@ a template function to be used by \code{add_workflow_step}
 This step template is similar to \code{netsim_scenarios} but for the HPC. It uses
 \code{slurmworkflow::step_tmpl_map} internally and should be used as any
 \code{slurmworkflow} step. For details, see \code{netsim_scenarios} documentation.
+The inner parallelization is by default handled with
+\code{future::plan("multicore", workers = n_cores)}.
+Using \verb{control$future.use.plan <- future::tweaked(<your plan>)} will bypass
+this setting.
 }
 \section{Checkpointing}{
 
diff --git a/man/step_tmpl_netsim_swfcalib_output.Rd b/man/step_tmpl_netsim_swfcalib_output.Rd
index 4e5fe24..5a1aa50 100644
--- a/man/step_tmpl_netsim_swfcalib_output.Rd
+++ b/man/step_tmpl_netsim_swfcalib_output.Rd
@@ -43,9 +43,11 @@ required for the model to run. (e.g. EpiModelHIV or EpiModelCOVID)}
 \item{setup_lines}{(optional) a vector of bash lines to be run first.
 This can be used to load the required modules (like R, python, etc).}
 
-\item{max_array_size}{maximum number of array jobs to be submitted at the
-same time. Should be strictly less than the maximum number of jobs you are
-allowed to submit to slurm on your HPC.}
+\item{max_array_size}{maximum number of array jobs to be submitted at once.
+It should be strictly less than the maximum number of jobs you are allowed
+to submit to \code{slurm} on your HPC. If the number of jobs is greater than
+\code{max_array_size}, they will be submitted in multiple batches. The
+submission of the next batch is automatically handled by \code{slurmworkflow}.}
 }
 \value{
 a template function to be used by \code{add_workflow_step}