diff --git a/paperless/README.md b/paperless/README.md
index 2a4ec85..b8f004e 100644
--- a/paperless/README.md
+++ b/paperless/README.md
@@ -8,3 +8,4 @@ Several environment variables have to be set:
 - postgres_version
 Paperless specific:
 - PAPERLESS_SECRET_KEY: A random string
+- PAPERLESS_URL: The URL of the paperless instance (used for CSRF, CORS)
diff --git a/paperless/docker-compose.yaml b/paperless/docker-compose.yaml
index 651c525..25a4a02 100644
--- a/paperless/docker-compose.yaml
+++ b/paperless/docker-compose.yaml
@@ -33,6 +33,7 @@ services:
       PAPERLESS_REDIS: redis://broker:6379
       PAPERLESS_DBHOST: db
       PAPERLESS_SECRET_KEY: ${PAPERLESS_SECRET_KEY}
+      PAPERLESS_URL: ${PAPERLESS_URL}
       PAPERLESS_OCR_LANGUAGE: deu
       PAPERLESS_ENABLE_HTTP_REMOTE_USER: true