From 6af38e16441d46aeef9ff34ab7467e54755940dd Mon Sep 17 00:00:00 2001
From: Doug Bird <retran@gmail.com>
Date: Tue, 12 Jun 2018 23:30:55 -0700
Subject: [PATCH] Update README.md

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index bb30998..a4a5509 100644
--- a/README.md
+++ b/README.md
@@ -192,6 +192,10 @@ $ bin/update-formats.sh
 ### TLD Update Utility Prerequisites
  * Node.js version 8.11 or higher.
  * (Optional) PHP command-line version 7.2 or higher, to create the [PHP format class file](#tld-list-formats).
+ * `npm install --dev` must have been performed (in the project root):
+   ```sh
+   npm install --dev
+   ```
 
 ### TLD Update Utility Usage
 ```txt