diff --git a/DESCRIPTION b/DESCRIPTION
index 5f84ad2..6c8be6c 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: dsOmics
 Type: Package
 Title: DataSHIELD server site Omic functions
-Version: 1.0.18
+Version: 1.0.18-2
 Date: 2021-07-08
 Authors@R: c(person("Yannick", "Marcon", , "yannick.marcon@obiba.org", role = "aut"),
   person("Xavier", "Esriba-Montagut", , "xavier.escriba@isglobal.org", role = "aut"),
@@ -78,7 +78,8 @@ AssignMethods:
    subsetGenoDS,
    geno_pca_pooled_addPCDS,
    geno_pca_pooled_addPC2GenoDS,
-   pDataDS
+   pDataDS,
+   methylation_array_convertDS
 Options:
     default.nfilter.diffP.epsilon=3,
     default.nfilter.diffP.resampleN=3,
@@ -88,5 +89,5 @@ License: MIT + file LICENSE
 biocViews: DNAMethylation, Microarray, Software, WholeGenome, GWAS, Non-disclosive
 LazyData: true
 VignetteBuilder: knitr
-RoxygenNote: 7.2.2.9000
+RoxygenNote: 7.2.3
 Encoding: UTF-8
diff --git a/NAMESPACE b/NAMESPACE
index e14c06b..4ef7d1f 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -44,6 +44,7 @@ export(getVariable)
 export(limmaDS)
 export(limmaDS2)
 export(make_valid_namesDS)
+export(methylation_array_convertDS)
 export(nFeaturesDS)
 export(nSamplesDS)
 export(pDataDS)
diff --git a/R/methylation_array_convertDS.R b/R/methylation_array_convertDS.R
new file mode 100644
index 0000000..c105bf3
--- /dev/null
+++ b/R/methylation_array_convertDS.R
@@ -0,0 +1,21 @@
+#' @title Convert methylation arrays
+#'
+#' @param eSet `ExpressionSet` to convert
+#' @param objective_array `character` Array to which conver (`"450k"` or `"epic"`)
+#'
+#' @return `ExpressionSet` converted
+#' @export
+#'
+methylation_array_convertDS <- function(eSet, objective_array){
+
+  if(objective_array == "450k"){
+    cpgs <- rownames(IlluminaHumanMethylation450kanno.ilmn12.hg19::SNPs.Illumina)
+  } else if (objective_array == "epic"){
+    cpgs <- rownames(IlluminaHumanMethylationEPICanno.ilm10b2.hg19::SNPs.Illumina)
+  } else {
+    stop()
+  }
+
+  eSet_converted <- eSet[rownames(eSet) %in% cpgs, ]
+  return(eSet_converted)
+}
\ No newline at end of file
diff --git a/man/Opal2FileResourceGetter.Rd b/man/Opal2FileResourceGetter.Rd
index d1ca451..616bf1f 100644
--- a/man/Opal2FileResourceGetter.Rd
+++ b/man/Opal2FileResourceGetter.Rd
@@ -7,19 +7,10 @@
 \format{
 A R6 object of class OpalFileResourceGetter
 }
-\value{
-A OpalFileResourceGetter object.
-
-A logical.
-
-The "resource.file" object.
-}
 \description{
-Creates a new OpalFileResourceGetter instance.
-
-Check that the provided resource has a URL that locates a Opal file: the URL scheme must be "opal+http" or "opal+https" and the path must designate a file web service entry point (i.e. starts with "ws/files/").
+Opal file resource getter
 
-Download the file from the Opal file system in a temporary location.
+Opal file resource getter
 }
 \details{
 Access a file that is stored in a Opal server. Use Basic authentication header if both
@@ -49,28 +40,56 @@ resource's identity and secret are defined, token authentication if secret only
 \if{html}{\out{<a id="method-Opal2FileResourceGetter-new"></a>}}
 \if{latex}{\out{\hypertarget{method-Opal2FileResourceGetter-new}{}}}
 \subsection{Method \code{new()}}{
+Creates a new OpalFileResourceGetter instance.
 \subsection{Usage}{
 \if{html}{\out{<div class="r">}}\preformatted{Opal2FileResourceGetter$new()}\if{html}{\out{</div>}}
 }
 
+\subsection{Returns}{
+A OpalFileResourceGetter object.
+}
 }
 \if{html}{\out{<hr>}}
 \if{html}{\out{<a id="method-Opal2FileResourceGetter-isFor"></a>}}
 \if{latex}{\out{\hypertarget{method-Opal2FileResourceGetter-isFor}{}}}
 \subsection{Method \code{isFor()}}{
+Check that the provided resource has a URL that locates a Opal file: the URL scheme must be "opal+http" or "opal+https" and the path must designate a file web service entry point (i.e. starts with "ws/files/").
 \subsection{Usage}{
 \if{html}{\out{<div class="r">}}\preformatted{Opal2FileResourceGetter$isFor(resource)}\if{html}{\out{</div>}}
 }
 
+\subsection{Arguments}{
+\if{html}{\out{<div class="arguments">}}
+\describe{
+\item{\code{resource}}{The resource object to validate.}
+}
+\if{html}{\out{</div>}}
+}
+\subsection{Returns}{
+A logical.
+}
 }
 \if{html}{\out{<hr>}}
 \if{html}{\out{<a id="method-Opal2FileResourceGetter-downloadFile"></a>}}
 \if{latex}{\out{\hypertarget{method-Opal2FileResourceGetter-downloadFile}{}}}
 \subsection{Method \code{downloadFile()}}{
+Download the file from the Opal file system in a temporary location.
 \subsection{Usage}{
 \if{html}{\out{<div class="r">}}\preformatted{Opal2FileResourceGetter$downloadFile(resource, ...)}\if{html}{\out{</div>}}
 }
 
+\subsection{Arguments}{
+\if{html}{\out{<div class="arguments">}}
+\describe{
+\item{\code{resource}}{A valid resource object.}
+
+\item{\code{...}}{Unused additional parameters.}
+}
+\if{html}{\out{</div>}}
+}
+\subsection{Returns}{
+The "resource.file" object.
+}
 }
 \if{html}{\out{<hr>}}
 \if{html}{\out{<a id="method-Opal2FileResourceGetter-clone"></a>}}
diff --git a/man/methylation_array_convertDS.Rd b/man/methylation_array_convertDS.Rd
new file mode 100644
index 0000000..f864290
--- /dev/null
+++ b/man/methylation_array_convertDS.Rd
@@ -0,0 +1,19 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/methylation_array_convertDS.R
+\name{methylation_array_convertDS}
+\alias{methylation_array_convertDS}
+\title{Convert methylation arrays}
+\usage{
+methylation_array_convertDS(eSet, objective_array)
+}
+\arguments{
+\item{eSet}{`ExpressionSet` to convert}
+
+\item{objective_array}{`character` Array to which conver (`"450k"` or `"epic"`)}
+}
+\value{
+`ExpressionSet` converted
+}
+\description{
+Convert methylation arrays
+}