diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 00000000..1502887d
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,4 @@
+{
+  "singleQuote": true,
+  "trailingComma": "es5"
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index 160c2aa7..3cfe1a44 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,15 @@ This repository holds the Go Website server code and content.
 The easiest way to install is to run `go get -u golang.org/x/website`. You can
 also manually git clone the repository to `$GOPATH/src/golang.org/x/website`.
 
+## JS/CSS Formatting
+
+This repository uses [prettier](https://prettier.io/) to format JS and CSS files.
+
+The version of `prettier` used is 1.18.2.
+
+It is encouraged that all JS and CSS code be run through this before submitting
+a change. However, it is not a strict requirement enforced by CI.
+
 ## Report Issues / Send Patches
 
 This repository uses Gerrit for code changes. To learn how to submit changes to