diff --git a/.env.example b/.env.example
index e74875e..ab72682 100644
--- a/.env.example
+++ b/.env.example
@@ -9,6 +9,9 @@ DJANGO_STATIC_VOL=/path/to/static/root
 # Path to the media root. Must be served by a webserver on the media URL
 DJANGO_MEDIA_VOL=/path/to/media/root
 
+# folder for DB
+PGDATA_VOL=/path/to/pgdata 
+
 # Port to serve the App
 PORT=8000
 
diff --git a/compose.yaml b/compose.yaml
index b9c9bb4..8182ea6 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -35,7 +35,7 @@ services:
       POSTGRES_PASSWORD: "${DJANGO_POSTGRESQL_PW:-p4ssw0rd}"
       POSTGRES_DB: "shimatta_kenkyusho"
     volumes:
-      - "${PGDATA:-./run/pgdata}:/var/lib/postgresql/data"
+      - "${PGDATA_VOL:-./run/pgdata}:/var/lib/postgresql/data"
     networks:
       - backendnet
     healthcheck: