diff --git a/packages/core/src/interfaces/axis-scales.ts b/packages/core/src/interfaces/axis-scales.ts
index 8a10272708..78da55d423 100644
--- a/packages/core/src/interfaces/axis-scales.ts
+++ b/packages/core/src/interfaces/axis-scales.ts
@@ -126,6 +126,18 @@ export interface AxisOptions extends BasedAxisOptions {
 	percentage?: boolean;
 }
 
+export interface ComboChartAxisOptions extends AxisOptions {
+	/**
+	 * should be set to `true` for the
+	 * left axis to be the primary axis
+	 */
+ 	main?: boolean;
+ 	/**
+  	 * used to map data on the secondary axis
+  	 */
+ 	correspondingDatasets?: Array<string>;
+}
+
 export interface BinnedAxisOptions {
 	/**
 	 * should be set to `true` on the domain
diff --git a/packages/core/src/interfaces/charts.ts b/packages/core/src/interfaces/charts.ts
index 2a4b972692..1052570f09 100644
--- a/packages/core/src/interfaces/charts.ts
+++ b/packages/core/src/interfaces/charts.ts
@@ -20,6 +20,7 @@ import { BarOptions, StackedBarOptions, ToolbarOptions } from './components';
 import {
 	AxisOptions,
 	BinnedAxisOptions,
+	ComboChartAxisOptions,
 	TimeScaleOptions,
 } from './axis-scales';
 
@@ -451,6 +452,7 @@ export interface RadarChartOptions extends BaseChartOptions {
  * options specific to combo charts
  */
 export interface ComboChartOptions extends AxisChartOptions {
+	axes?: AxesOptions<ComboChartAxisOptions>;
 	comboChartTypes: Array<{
 		type: ChartTypes | any;
 		options?: object;