diff --git a/DESCRIPTION b/DESCRIPTION
index 9ce97ba..8eb75d3 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -26,4 +26,4 @@ Imports: RColorBrewer,
         data.table,
         igraph,
         enviGCMS
-RoxygenNote: 7.2.3
+RoxygenNote: 7.3.1
diff --git a/NAMESPACE b/NAMESPACE
index bf7437e..f7f1b85 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -8,6 +8,7 @@ export(getms2pmd)
 export(getmspmd)
 export(getpaired)
 export(getpmd)
+export(getpmddf)
 export(getposneg)
 export(getrda)
 export(getreact)
diff --git a/man/getpmddf.Rd b/man/getpmddf.Rd
new file mode 100644
index 0000000..e840f55
--- /dev/null
+++ b/man/getpmddf.Rd
@@ -0,0 +1,32 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/sda.R
+\name{getpmddf}
+\alias{getpmddf}
+\title{Get pmd details for specific reaction after the removal of isotopouge.}
+\usage{
+getpmddf(mz, group = NULL, pmd = NULL, digits = 2, mdrange = c(0.25, 0.9))
+}
+\arguments{
+\item{mz}{a vector of mass to charge ratio.}
+
+\item{group}{mass to charge ratio group from either retention time or mass spectrometry imaging segmentation.}
+
+\item{pmd}{a specific paired mass distance or a vector of pmds}
+
+\item{digits}{mass or mass to charge ratio accuracy for pmd, default 2.}
+
+\item{mdrange}{mass defect range to ignore. Default c(0.25,0.9) to retain the possible reaction related paired mass.}
+}
+\value{
+dataframe with paired peaks for specific pmd or pmds. When group is provided, a column named net will be generated to show if certain pmd will be local(within the same group) or global(across the groups)
+}
+\description{
+Get pmd details for specific reaction after the removal of isotopouge.
+}
+\examples{
+data(spmeinvivo)
+pmddf <- getpmddf(spmeinvivo$mz,pmd=15.99)
+}
+\seealso{
+\code{\link{getpaired}},\code{\link{getstd}},\code{\link{getsda}},\code{\link{getrda}}
+}