diff --git a/readme.md b/readme.md
index 36c505fe..f77ea227 100644
--- a/readme.md
+++ b/readme.md
@@ -282,7 +282,7 @@ Use one or more [shareable configs](https://eslint.org/docs/developer-guide/shar
 
 Type: `string[]`
 
-Allow more extensions to be linted besides `.js`, `.jsx`, `.mjs`, and `.cjs`. Make sure they're supported by ESLint or an ESLint plugin.
+Allow more extensions to be linted besides `.js`, `.jsx`, `.mjs`, and `.cjs` as well as their TypeScript equivalents `.ts`, `.tsx`, `.mts` and `.cts`. Make sure they're supported by ESLint or an ESLint plugin.
 
 ### settings