diff --git a/eslint/babel-eslint-plugin/README.md b/eslint/babel-eslint-plugin/README.md
index 70f6f833a5..da1dfe2208 100644
--- a/eslint/babel-eslint-plugin/README.md
+++ b/eslint/babel-eslint-plugin/README.md
@@ -48,7 +48,7 @@ Each rule corresponds to a core `eslint` rule, and has the same options.
 - `babel/object-curly-spacing`: doesn't complain about `export x from "mod";` or `export * as x from "mod";` (🛠)
 - `babel/quotes`: doesn't complain about JSX fragment shorthand syntax (`<>foo</>;`)
 - `babel/semi`: doesn't fail when using `for await (let something of {})`. Includes class properties (🛠)
-- `babel/no-unused-expressions`: doesn't fail when using `do` expressions
+- `babel/no-unused-expressions`: doesn't fail when using `do` expressions or [optional chaining](https://github.com/tc39/proposal-optional-chaining) (`a?.b()`).
 
 #### Deprecated