diff --git a/docs/docker.sample.env b/docs/docker.sample.env
index b9514150..3d40577e 100644
--- a/docs/docker.sample.env
+++ b/docs/docker.sample.env
@@ -4,7 +4,7 @@ ROCKET_SECRET_KEY=randomstringhere
 
 # you can safely leave those defaults
 DATABASE_URL=postgres://plume:plume@postgres:5432/plume
-MIGRATION_DIR=postgres
+MIGRATION_DIR=migrations/postgres
 USE_HTTPS=1
 ROCKET_ADDRESS=0.0.0.0
 ROCKET_PORT=7878