diff --git a/packages/draft-js-export-html/typings/index.d.ts b/packages/draft-js-export-html/typings/index.d.ts
index ec40b149..ce8dc0e5 100644
--- a/packages/draft-js-export-html/typings/index.d.ts
+++ b/packages/draft-js-export-html/typings/index.d.ts
@@ -5,7 +5,7 @@ declare module 'draft-js-export-html' {
 
     type BlockStyleFn = (block: draftjs.ContentBlock) => RenderConfig|undefined;
     type EntityStyleFn = (entity: draftjs.EntityInstance) => RenderConfig|undefined;
-    type BlockRenderer = (block: draftjs.ContentBlock) => string;
+    type BlockRenderer = (block: draftjs.ContentBlock) => string|null|undefined;
     type RenderConfig = {
         element?: string;
         attributes?: any;
@@ -13,7 +13,7 @@ declare module 'draft-js-export-html' {
     };
 
     export interface Options {
-        defaultBlockTag?: string;
+        defaultBlockTag?: string|null;
         inlineStyles?: { [styleName: string]: RenderConfig };
         blockRenderers?: { [blockType: string]: BlockRenderer };
         blockStyleFn?: BlockStyleFn;