diff --git a/.env.foundation-oauth.example b/.env.foundation-oauth.example
new file mode 100644
index 00000000..dafd6854
--- /dev/null
+++ b/.env.foundation-oauth.example
@@ -0,0 +1,14 @@
+# Foundation OAuth Configuration
+# These variables are needed for Phase 3: Switchover
+
+# URL of the Foundation identity provider (aethex.foundation)
+VITE_FOUNDATION_URL=https://aethex.foundation
+
+# OAuth client secret issued by Foundation for aethex-corp
+# This will be generated during Foundation setup (Phase 1)
+# Request this from the Foundation admin after Phase 1 is complete
+FOUNDATION_OAUTH_CLIENT_SECRET=your-foundation-oauth-client-secret-here
+
+# Optional: For development/testing, use localhost
+# VITE_FOUNDATION_URL=http://localhost:3001
+# FOUNDATION_OAUTH_CLIENT_SECRET=dev-secret