diff --git a/DESCRIPTION b/DESCRIPTION
index 956ff4b..28adbdc 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: scFeatures
 Title: scFeatures: Multi-view representations of single-cell and spatial data
        for disease outcome prediction
-Version: 1.3.1
+Version: 1.3.2
 Authors@R: 
     c(
     person(given = "Yue",family = "Cao", email = "yue.cao@sydney.edu.au",  role=c("aut", "cre")),
diff --git a/R/utils.R b/R/utils.R
index 507cf16..a13afd5 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -213,8 +213,7 @@ bulk_sample <- function(alldata, ncores = 1) {
 #'
 #' data("example_scrnaseq" , package = "scFeatures")
 #' data <- example_scrnaseq
-#' data$celltype <- NULL
-#'
+#' data <- list(data = data)
 #' number_of_cells <- get_num_cell_per_spot(data)
 #'
 #'
diff --git a/man/get_num_cell_per_spot.Rd b/man/get_num_cell_per_spot.Rd
index a97c308..7b6d48d 100644
--- a/man/get_num_cell_per_spot.Rd
+++ b/man/get_num_cell_per_spot.Rd
@@ -24,8 +24,7 @@ This value stored in the \code{number_cells} attribute.
 
 data("example_scrnaseq" , package = "scFeatures")
 data <- example_scrnaseq
-data$celltype <- NULL
-
+data <- list(data = data)
 number_of_cells <- get_num_cell_per_spot(data)