diff --git a/react-syntax-highlighter/index.d.ts b/react-syntax-highlighter/index.d.ts
index 57d81c9d6d..94cf519204 100644
--- a/react-syntax-highlighter/index.d.ts
+++ b/react-syntax-highlighter/index.d.ts
@@ -12,6 +12,8 @@ declare module 'react-syntax-highlighter' {
 declare module 'react-syntax-highlighter/dist/light' {
     import * as React from 'react';
 
+    export function registerLanguage(name: string, func: any): void;
+
     interface SyntaxHighlighterProps {
         language?: string;
         style?: any;
@@ -498,4 +500,4 @@ declare module 'react-syntax-highlighter/dist/styles/xt256' {
 declare module 'react-syntax-highlighter/dist/styles/zenburn' {
     const style: any;
     export default style;
-}
\ No newline at end of file
+}