diff --git a/types/google.visualization/index.d.ts b/types/google.visualization/index.d.ts
index e5e400bc44..878e17a011 100644
--- a/types/google.visualization/index.d.ts
+++ b/types/google.visualization/index.d.ts
@@ -597,6 +597,7 @@ declare namespace google {
             chartArea?: ChartArea;
             colors?: string[];
             enableInteractivity?: boolean;
+            explorer?: ChartExplorer;
             focusTarget?: string;
             fontSize?: number;
             fontName?: string;