diff --git a/README.md b/README.md
index 2efd44e..94b7d58 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,12 @@ to facilitate the play and administration of [tabletop roleplaying games][]
 
 ## Installing
 
+First, make a `src/.env` file from the provided `src/.env.example` file,
+replacing the placeholder values with your own Discord client ID and Realm API
+server address.
+
+Then, build the static site:
+
 ```shell
 npm login --scope @haliphax  # password is your GitHub auth token
 npm run build
diff --git a/src/.env.example b/src/.env.example
new file mode 100644
index 0000000..18ad568
--- /dev/null
+++ b/src/.env.example
@@ -0,0 +1,2 @@
+VITE_APP_CLIENT_ID=1234
+VITE_APP_REALM_API=http://localhost:5173