diff --git a/README.md b/README.md
index 02c9bed4e..a334a0d91 100644
--- a/README.md
+++ b/README.md
@@ -1127,7 +1127,7 @@ To install the latest stable version:
 npm install --save pdf-lib
 
 # With yarn
-yarn add pdf-lib
+yarn add -D pdf-lib
 ```
 
 This assumes you're using [npm](https://www.npmjs.com/) or [yarn](https://yarnpkg.com/lang/en/) as your package manager.