diff --git a/README.md b/README.md
index a6cf7ef3..a2befc8f 100644
--- a/README.md
+++ b/README.md
@@ -84,6 +84,7 @@ docker container create --name doccano \
   -e "ADMIN_USERNAME=admin" \
   -e "ADMIN_EMAIL=admin@example.com" \
   -e "ADMIN_PASSWORD=password" \
+  -v doccano-db:/data \
   -p 8000:8000 doccano/doccano
 ```
 
diff --git a/docs/install-and-upgrade-doccano.md b/docs/install-and-upgrade-doccano.md
index 5ef04eb7..a8ed4504 100644
--- a/docs/install-and-upgrade-doccano.md
+++ b/docs/install-and-upgrade-doccano.md
@@ -66,6 +66,7 @@ docker container create --name doccano \
   -e "ADMIN_USERNAME=admin" \
   -e "ADMIN_EMAIL=admin@example.com" \
   -e "ADMIN_PASSWORD=password" \
+  -v doccano-db:/data \
   -p 8000:8000 doccano/doccano
 ```