Programming-With-Love
diff --git a/‎README.md
+1-1 b/‎README.md
+1-1
diff --git a/‎README_zh.md
+1-1 b/‎README_zh.md
+1-1
@@ -148,7 +148,7 @@ func main() {
         f.SetSheetRow("Sheet1", cell, &row)
     }
     if err := f.AddChart("Sheet1", "E1", &excelize.Chart{
-        Type: "col3DClustered",
+        Type: excelize.Col3DClustered,
         Series: []excelize.ChartSeries{
             {
                 Name:       "Sheet1!$A$2",
 
@@ -148,7 +148,7 @@ func main() {
         f.SetSheetRow("Sheet1", cell, &row)
     }
     if err := f.AddChart("Sheet1", "E1", &excelize.Chart{
-        Type: "col3DClustered",
+        Type: excelize.Col3DClustered,
         Series: []excelize.ChartSeries{
             {
                 Name:       "Sheet1!$A$2",
Original file line number	Diff line number	Diff line change
`@@ -148,7 +148,7 @@ func main() {`
`148`	`148`	`f.SetSheetRow("Sheet1", cell, &row)`
`149`	`149`	`}`
`150`	`150`	`if err := f.AddChart("Sheet1", "E1", &excelize.Chart{`
`151`		`- Type: "col3DClustered",`
	`151`	`+ Type: excelize.Col3DClustered,`
`152`	`152`	`Series: []excelize.ChartSeries{`
`153`	`153`	`{`
`154`	`154`	`Name: "Sheet1!$A$2",`