diff --git a/.env.example b/.env.example
index d843ca2a..b3cf1ed0 100644
--- a/.env.example
+++ b/.env.example
@@ -23,7 +23,8 @@ BACKEND_DOMAIN_NAME=backend.example.com
 # Obtain the following 2 values on the Pi Developer Portal (open develop.pi in the Pi Browser).
 
 # Domain validation key:
-DOMAIN_VALIDATION_KEY=todo_developer_portal
+DOMAIN_VALIDATION_KEY=09e5904cac44552ff3a89ed845e98b493aa7856c3d9584d783f2bc49b6eba041bd62026a831c80148693e4a924651d79a98199b2c6a3ce9c0e2c4f575e824bc8
+
 # Pi Platform API Key:
 PI_API_KEY=todo_developer_portal