From 0f352a4b5cb0f41afa948a8883b437af08b2eaf8 Mon Sep 17 00:00:00 2001
From: xmatthias <xmatthias@outlook.com>
Date: Sun, 3 Jun 2018 15:14:51 +0200
Subject: [PATCH] update contributing document to include mypy

---
 CONTRIBUTING.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 967f57b65..93089495b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -42,4 +42,16 @@ pip3.6 install flake8 coveralls
 flake8 freqtrade
 ```
 
+## 3. Test if all type-hints are correct
 
+**Install packages** (If not already installed)
+
+``` bash
+pip3.6 install mypy
+```
+
+**Run mypy**
+
+``` bash
+mypy freqtrade
+```