From 72cb1f9b78dd10dc214c1b2b4f70ba1cfebc4476 Mon Sep 17 00:00:00 2001
From: "Rico Sta. Cruz" <rstacruz@users.noreply.github.com>
Date: Thu, 21 Sep 2017 13:10:14 +0800
Subject: [PATCH] flow: teach type inference

---
 flow.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/flow.md b/flow.md
index bdd548c3b..852687a65 100644
--- a/flow.md
+++ b/flow.md
@@ -26,6 +26,17 @@ Most of what you need to do is to simply add annotations to function arguments!
 
 See: [flow.org docs](https://flow.org/en/docs/)
 
+### Type inference
+
+```js
+function square (n: number) {
+  const result = n * n
+}
+```
+{: data-line="2"}
+
+`result` is inferred to be a number because `number * number` will result in a number. There's no need to give it annotations.
+
 ### Type aliases
 
 ```js