diff --git a/src/lv_objx/lv_chart.h b/src/lv_objx/lv_chart.h
index d0ca97df1..28de00b01 100644
--- a/src/lv_objx/lv_chart.h
+++ b/src/lv_objx/lv_chart.h
@@ -44,6 +44,14 @@ enum
 };
 typedef uint8_t lv_chart_type_t;
 
+/*Chart update mode*/
+enum
+{
+	LV_CHART_MODE_SHIFT,
+	LV_CHART_MODE_CIRCULAR,
+};
+typedef uint8_t lv_chart_update_mode_t;
+    
 typedef struct
 {
     lv_coord_t * points;
@@ -63,6 +71,7 @@ typedef struct
     uint8_t vdiv_cnt;       /*Number of vertical division lines*/
     uint16_t point_cnt;     /*Point number in a data line*/
     lv_chart_type_t type;   /*Line, column or point chart (from 'lv_chart_type_t')*/
+    uint8_t update_mode: 1;
     struct {
         lv_coord_t width;  /*Line width or point radius*/
         uint8_t num;       /*Number of data lines in dl_ll*/