diff --git a/R/SCP-plot.R b/R/SCP-plot.R
index ad4a980f..33ddbd21 100644
--- a/R/SCP-plot.R
+++ b/R/SCP-plot.R
@@ -1249,7 +1249,7 @@ BlendRGBList <- function(Clist, mode = "blend", RGB_BackGround = c(1, 1, 1)) {
 #'
 #' # Add various shape of marks
 #' CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE)
-#' CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE, mark_expand = unit(1, "mm"))
+#' CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE, mark_expand = grid::unit(1, "mm"))
 #' CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE, mark_alpha = 0.3)
 #' CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE, mark_linetype = 2)
 #' CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE, mark_type = "ellipse")
diff --git a/man/CellDimPlot.Rd b/man/CellDimPlot.Rd
index f3aa3e8c..bbc30e44 100644
--- a/man/CellDimPlot.Rd
+++ b/man/CellDimPlot.Rd
@@ -395,7 +395,7 @@ CellDimPlot(pancreas_sub,
 
 # Add various shape of marks
 CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE)
-CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE, mark_expand = unit(1, "mm"))
+CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE, mark_expand = grid::unit(1, "mm"))
 CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE, mark_alpha = 0.3)
 CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE, mark_linetype = 2)
 CellDimPlot(pancreas_sub, group.by = "SubCellType", reduction = "UMAP", add_mark = TRUE, mark_type = "ellipse")