diff --git a/types/chart.js/index.d.ts b/types/chart.js/index.d.ts
index c2ae788396..f4f4bda40d 100644
--- a/types/chart.js/index.d.ts
+++ b/types/chart.js/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for Chart.js 2.6
+// Type definitions for Chart.js 2.7
 // Project: https://github.com/nnnick/Chart.js
 // Definitions by: Alberto Nuti <https://github.com/anuti>
 //                 Fabien Lavocat <https://github.com/FabienLavocat>
@@ -114,18 +114,25 @@ declare namespace Chart {
         index?: number;
     }
 
+    interface ChartTooltipLabelColor {
+        borderColor: ChartColor;
+        backgroundColor: ChartColor;
+    }
+
     interface ChartTooltipCallback {
-        beforeTitle?(item?: ChartTooltipItem[], data?: any): void;
-        title?(item?: ChartTooltipItem[], data?: any): void;
-        afterTitle?(item?: ChartTooltipItem[], data?: any): void;
-        beforeBody?(item?: ChartTooltipItem[], data?: any): void;
-        beforeLabel?(tooltipItem?: ChartTooltipItem, data?: any): void;
-        label?(tooltipItem?: ChartTooltipItem, data?: any): void;
-        afterLabel?(tooltipItem?: ChartTooltipItem, data?: any): void;
-        afterBody?(item?: ChartTooltipItem[], data?: any): void;
-        beforeFooter?(item?: ChartTooltipItem[], data?: any): void;
-        footer?(item?: ChartTooltipItem[], data?: any): void;
-        afterFooter?(item?: ChartTooltipItem[], data?: any): void;
+        beforeTitle?(item: ChartTooltipItem[], data: ChartData): string | string[];
+        title?(item: ChartTooltipItem[], data: ChartData): string | string[];
+        afterTitle?(item: ChartTooltipItem[], data: ChartData): string | string[];
+        beforeBody?(item: ChartTooltipItem[], data: ChartData): string | string[];
+        beforeLabel?(tooltipItem: ChartTooltipItem, data: ChartData): string | string[];
+        label?(tooltipItem: ChartTooltipItem, data: ChartData): string | string[];
+        labelColor?(tooltipItem: ChartTooltipItem, chart: Chart): ChartTooltipLabelColor;
+        labelTextColor?(tooltipItem: ChartTooltipItem, chart: Chart): string;
+        afterLabel?(tooltipItem: ChartTooltipItem, data: ChartData): string | string[];
+        afterBody?(item: ChartTooltipItem[], data: ChartData): string | string[];
+        beforeFooter?(item: ChartTooltipItem[], data: ChartData): string | string[];
+        footer?(item: ChartTooltipItem[], data: ChartData): string | string[];
+        afterFooter?(item: ChartTooltipItem[], data: ChartData): string | string[];
     }
 
     interface ChartAnimationParameter {