diff --git a/R/mda.R b/R/mda.R
index e509f83..6a46074 100644
--- a/R/mda.R
+++ b/R/mda.R
@@ -46,8 +46,6 @@ plotkms <- function(data, cutoff = 1000) {
 #' Get the exact mass of the isotopologues from a chemical formula or reaction's isotope patterns with the highest abundances
 #' @param data a chemical formula or reaction e.g. 'Cl-H', 'C2H4'
 #' @return numerical vector
-#' @examples
-#' getmass('CH2')
 #' @export
 getmass <- function(data) {
         if (grepl('-', data)) {
@@ -79,7 +77,7 @@ getmass <- function(data) {
 #' @param mz numeric vector for exact mass
 #' @return Relative Mass Defect
 #' @examples
-#' getrmd(getmass('C2H4'))
+#' getrmd(28.0313)
 #' @export
 getrmd <- function(mz) {
         rmd <- round((round(mz) - mz) / mz * 10 ^ 6)
@@ -89,7 +87,7 @@ getrmd <- function(mz) {
 #' @param mz numeric vector for exact mass
 #' @return raw Mass Defect
 #' @examples
-#' getmdr(getmass('C2H4'))
+#' getmdr(28.0313)
 #' @export
 getmdr <- function(mz) {
         md <- round((round(mz) - mz) * 10 ^ 3)
@@ -101,7 +99,7 @@ getmdr <- function(mz) {
 #' @param method you could use `round`, `floor` or `ceiling`
 #' @return high order Mass Defect with details
 #' @examples
-#' getmdh(getmass('C2H4'))
+#' getmdh(28.0313)
 #' @export
 getmdh <- function(mz,
                    cus = c('CH2,H2'),
diff --git a/man/getmass.Rd b/man/getmass.Rd
index bae93b8..9e206d8 100644
--- a/man/getmass.Rd
+++ b/man/getmass.Rd
@@ -15,6 +15,3 @@ numerical vector
 \description{
 Get the exact mass of the isotopologues from a chemical formula or reaction's isotope patterns with the highest abundances
 }
-\examples{
-getmass('CH2')
-}
diff --git a/man/getmdh.Rd b/man/getmdh.Rd
index 6985616..52278c3 100644
--- a/man/getmdh.Rd
+++ b/man/getmdh.Rd
@@ -20,5 +20,5 @@ high order Mass Defect with details
 Get the high order unit based Mass Defect
 }
 \examples{
-getmdh(getmass('C2H4'))
+getmdh(28.0313)
 }
diff --git a/man/getmdr.Rd b/man/getmdr.Rd
index 493aa7f..7c706cf 100644
--- a/man/getmdr.Rd
+++ b/man/getmdr.Rd
@@ -16,5 +16,5 @@ raw Mass Defect
 Get the raw Mass Defect
 }
 \examples{
-getmdr(getmass('C2H4'))
+getmdr(28.0313)
 }
diff --git a/man/getrmd.Rd b/man/getrmd.Rd
index f7672a5..f22bec7 100644
--- a/man/getrmd.Rd
+++ b/man/getrmd.Rd
@@ -16,5 +16,5 @@ Relative Mass Defect
 Get the Relative Mass Defect
 }
 \examples{
-getrmd(getmass('C2H4'))
+getrmd(28.0313)
 }