Update docs

Author: Igorbek

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 ## [Unreleased]
 
 - transform anonymous default exports (fix #371 in #367)
-- remove deprecated .extend transformation pattern (fix #48 in #370)
+- remove deprecated `.extend` transformation pattern (fix #48 in #370)
 
 ## [1.4.4]
 
@@ -25,7 +25,7 @@ All notable changes to this project will be documented in this file.
 ## [1.4.0]
 
 - add experimental support of minification (#14, #35)
-- skip emitting empty withConfig (#37)
+- skip emitting empty `withConfig` (#37)
 
 ## [1.4.0-rc]
 

README.md

@@ -289,6 +289,7 @@ interface CustomStyledIdentifiers {
     keyframes: string[];
     css: string[];
     createGlobalStyle: string[];
+    extend: string[];
 }
 ```
 
@@ -297,6 +298,7 @@ interface CustomStyledIdentifiers {
 - `keyframes` - list of identifiers of `keyframes` API (default `['keyframes']`)
 - `css` - list of identifiers of `css` API (default `['css']`)
 - `createGlobalStyle` - list of identifiers of `createGlobalStyle` API (default `['createGlobalStyle']`)
+- `extend` - list of identifiers of `extend` API (default `[]`). Note this API has been deprecated in `styled-components` so starting from `1.5` this option by default has empty set, which means it does not recognize this API by default.
 
 Example