diff --git a/README.md b/README.md
index a4602cf..85a943c 100644
--- a/README.md
+++ b/README.md
@@ -127,7 +127,7 @@ describe("hello", function () {
 
 ### Node
 
-Do an `npm install sinon-chai` to get up and running. Then:
+Do an `npm install --save-dev sinon-chai` to get up and running. Then:
 
 ```javascript
 var chai = require("chai");