extra polyfills must be included manually (#5814)

* extra polyfills must be included manually, fixes #5795 * make note italicized
facebook · Nov 16, 2018 · 7e25df1 · 7e25df1
1 parent 69babbb
commit 7e25df1
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diff --git a/packages/react-app-polyfill/README.md b/packages/react-app-polyfill/README.md
@@ -13,6 +13,8 @@ Each polyfill ensures the following language features are present:
 1. `Symbol` (a built-in object used by `for...of` syntax and friends)
 1. `Array.from` (a built-in static method used by array spread, i.e. `[...arr]`)
 
+*If you need more features, you must include them manually.*
+
 ### Usage
 
 First, install the package using Yarn or npm: