diff --git a/README.md b/README.md
index a052a054c..52556b07f 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ ### Installation Video Guide
 ### Traditional Installation
 
 ```bash
-# Step 1: Ensure that NPM is installed on your system. Then install mermaid-js.
+# Step 1: Ensure that NPM is installed on your system. Then install mermaid-js. (If you don't have npm in your computer, please go to the Node.js offical website to install Node.js https://nodejs.org/ and then you will have npm tool in your computer.)
 npm --version
 sudo npm install -g @mermaid-js/mermaid-cli