diff --git a/NAMESPACE b/NAMESPACE
index ed32db276766c91133b0dd89c7d53340e82e63a3..d1c6afeeab92b0e99df6719e4b8fbbb4898a84a2 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -2,6 +2,7 @@
 
 export(mb.do)
 export(mb.prep)
+export(presc.do)
 export(presc.p)
 export(presc.single)
 export(presc.v)
diff --git a/R/run.R b/R/run.R
index 0479082625327ff14ea6acab106a65f05b2f347e..629a1a8db83f4be400f4e5406afced635bed1406 100644
--- a/R/run.R
+++ b/R/run.R
@@ -8,6 +8,31 @@
 attch<-function(...) paste(...,sep='')
 
 
+##' Do the prescreening.
+##'
+##' @title Prescreening on bunch of files.
+##' @param fn_data The mzML files. Basis for the out directory name
+##'     generation.
+##' @param fn_cmpd_list The compound list CSV.
+##' @param mode RMB mode.
+##' @param proc Amount of processors, or FALSE. 
+##' @return Nothing useful.
+##' @author Todor Kondić
+##' @export
+presc.do<-function(fn_data,fn_cmpd_list,mode,proc=F) {
+
+
+    if (proc) {
+        cl<-parallel::makeCluster(proc)
+        presc.p(fn_data,fn_cmpd_l=fn_cmpd_list,mode=mode,cl=cl)
+    } else {
+        presc.v(fn_data,fn_cmpd_l=fn_cmpd_list,mode)
+    }
+}
+
+
+
+
 ##' Performs massbank workflow on multiple mzML files:
 ##'
 ##'
diff --git a/man/presc.do.Rd b/man/presc.do.Rd
new file mode 100644
index 0000000000000000000000000000000000000000..f001b9bae73f1fd4e24fd0af8d85d96d98f85300
--- /dev/null
+++ b/man/presc.do.Rd
@@ -0,0 +1,27 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/run.R
+\name{presc.do}
+\alias{presc.do}
+\title{Prescreening on bunch of files.}
+\usage{
+presc.do(fn_data, fn_cmpd_list, mode, proc = F)
+}
+\arguments{
+\item{fn_data}{The mzML files. Basis for the out directory name
+generation.}
+
+\item{fn_cmpd_list}{The compound list CSV.}
+
+\item{mode}{RMB mode.}
+
+\item{proc}{Amount of processors, or FALSE.}
+}
+\value{
+Nothing useful.
+}
+\description{
+Do the prescreening.
+}
+\author{
+Todor Kondić
+}