diff --git a/.env.example.production b/.env.example.production
index e840433..facef53 100644
--- a/.env.example.production
+++ b/.env.example.production
@@ -7,6 +7,9 @@ CRAFT_APP_ID=
 # The environment Craft is currently running in (dev, staging, production, etc.)
 CRAFT_ENVIRONMENT=production
 
+# The URL of the primary site
+PRIMARY_SITE_URL=https://example.com
+
 # The secure key Craft will use for hashing and encrypting data
 CRAFT_SECURITY_KEY=