diff --git a/README.md b/README.md
index b5a7cfd..b485cc2 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,8 @@ This repository includes examples of [stdio interface implementation](https://gi
 
 ### Initialization
 ```js
-const { glkInterface, sendFn } = CheapGlkOte(handlers [, loggers])
+const { glkInterface, sendFn } =
+  CheapGlkOte(handlers [, { loggers, size }])
 ```
 
 ### Input
@@ -88,6 +89,15 @@ const defaultLoggers = {
 }
 ```
 
+### Size
+Default sizes:
+```js
+const defaultSize = {
+  width: 80,
+  height: 25
+}
+```
+
 ## Inspired and powered by
 
 - [glkote-term](https://github.com/curiousdannii/glkote-term)