diff --git a/.env.example b/.env.example
index d843ca2a..8b1fa32e 100644
--- a/.env.example
+++ b/.env.example
@@ -23,7 +23,7 @@ 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=eda32a7b48a672425d67b8fe55d3d3f9f6c50438325230d7a9caeb2d226675d1902647c16c8435f8eebecd0e2ad60a7819f03e1e84f42e090e2394f936d2ffdf
 # Pi Platform API Key:
 PI_API_KEY=todo_developer_portal