diff --git a/.env.sample b/.env.sample
index 5974f32..e971a0d 100644
--- a/.env.sample
+++ b/.env.sample
@@ -12,6 +12,9 @@ VITE_SUPABASE_ANON_KEY=your-anon-key
 # Optional: for OAuth / magic link redirects
 # VITE_SUPABASE_REDIRECT_URL=http://localhost:5173
 
+# Set to "true" to disable new user registration (login still works)
+# VITE_DISABLE_REGISTRATION=false
+
 # App uses schema "omotomo" for decks/questions. Ensure the API exposes it:
 # Self-hosted: add "omotomo" to PostgREST db-schemas (e.g. in config).
 # Cloud: Dashboard > Project Settings > API > Exposed schemas.