diff --git a/README.md b/README.md
index 29e36da..fa52468 100644
--- a/README.md
+++ b/README.md
@@ -3,9 +3,11 @@
 ## Requirements to develop
 - Node.js 14.x
 - MongoDB 4.x
+- Yarn package manager (version 1.x)
 
 ## Setting up develop
 - Clone this repo
+- Run `yarn install`
 - Copy `example.env` to `.env`
 - Edit `.env`
     - Change `LOGGING_LEVEL` to `7`