diff --git a/.env.docker.sample b/.env.docker.sample
index 7fce7cd..6c2c1d6 100644
--- a/.env.docker.sample
+++ b/.env.docker.sample
@@ -5,5 +5,6 @@ DB_PASSWORD=password
 DB_HOST=auth_db
 DB_PORT=5432
 DB_SSLMODE=disable
+DATABASE_URL=postgres://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:5432/${DB_NAME}
 ENABLE_REGISTRATION=true
 ALLOWED_ORIGINS="http://textsender.com"
diff --git a/.env.local.sample b/.env.local.sample
index 11f68eb..2625bcf 100644
--- a/.env.local.sample
+++ b/.env.local.sample
@@ -5,5 +5,6 @@ DB_PASSWORD=password
 DB_HOST=localhost
 DB_PORT=5432
 DB_SSLMODE=disable
+DATABASE_URL=postgres://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:5432/${DB_NAME}
 ENABLE_REGISTRATION=true
 ALLOWED_ORIGINS="http://textsender.com"