diff --git a/packages/core/src/interfaces/axis-scales.ts b/packages/core/src/interfaces/axis-scales.ts
index 8a10272708..8c7a5ba09b 100644
--- a/packages/core/src/interfaces/axis-scales.ts
+++ b/packages/core/src/interfaces/axis-scales.ts
@@ -124,6 +124,15 @@ export interface AxisOptions extends BasedAxisOptions {
 	 * option for percentage axis scale
 	 */
 	percentage?: boolean;
+	/**
+	 * 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 {