diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..55cf18f
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,5 @@
+# Copy to .env. Do not commit the result.
+RELAY_ENDPOINT=
+RELAY_USER=
+RELAY_TOKEN=
+CONTAINMENT_CODE=