Update README.md

kulshekhar · Mar 2, 2018 · 14f5949 · 14f5949
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diff --git a/README.md b/README.md
@@ -55,6 +55,10 @@ To use this in your project, run:
 ```sh
 npm install --save-dev ts-jest @types/jest
 ```
+If you don't already have jest installed,
+```sh
+npm install --save-dev jest ts-jest @types/jest
+```
 Modify your project's `package.json` so that the `jest` section looks something like:
 ```json
 {