diff --git a/index.d.ts b/index.d.ts
index ebcfe4643..a9b94d79f 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -167,6 +167,8 @@ declare module 'spectacle' {
     theme?: Theme;
     transition?: transitionType[];
     transitionDuration?: number;
+    contentWidth?: string;
+    contentHeight?: string;
   }
 
   interface FillProps {