diff --git a/README.md b/README.md
index 4b4272ec0006e28241c58ddacea239c0c7feeeff..f5c4f1a98367ac122b0cc1fd790e3b922cbb403c 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,11 @@ Library implements normalisation of HTML and plain parts of a MIME message.
 Normalisation strategies documentation:
 https://code.vereign.com/light/documentation/-/blob/master/Validation.md#normalization-strategies
 
-# Initialize project
+## Prerequisites
+- [Node.JS](https://nodejs.org/en/) v9+
+- [yarn](https://yarnpkg.com/getting-started/install) package manager
+
+## Initialize project
 `yarn install`
 
 ## Testing