diff --git a/.env.example b/.env.example
index 87bd29e..fd29b8f 100644
--- a/.env.example
+++ b/.env.example
@@ -4,8 +4,9 @@ DOCKER_SEND_IMAGE=mozilla/send:latest
 # Host to expose Send on
 HOST=send.example.org
 
-# Base URL for Send
-SEND_BASE_URL=https://send.example.org
+# Some exposed Send properties, see Send configuration
+SEND_BASE_URL=
+SEND_FILE_DIR=
 
 # Optional: for LetsEncrypt SSL, same as HOST
 LETSENCRYPT_HOST=
diff --git a/README.md b/README.md
index f56d17e..db38a07 100644
--- a/README.md
+++ b/README.md
@@ -25,8 +25,9 @@ DOCKER_SEND_IMAGE=mozilla/send:latest
 # Host to expose Send on
 HOST=send.example.org
 
-# Base URL for Send
-SEND_BASE_URL=https://send.example.org
+# Some exposed Send properties, see Send configuration
+SEND_BASE_URL=
+SEND_FILE_DIR=
 
 # Optional: for LetsEncrypt SSL, same as HOST
 LETSENCRYPT_HOST=
diff --git a/docker-compose.yaml b/docker-compose.yaml
index fef3f13..013989f 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -42,6 +42,7 @@ services:
       - PORT=1234
       - REDIS_HOST=redis
       - BASE_URL=${SEND_BASE_URL}
+      - FILE_DIR=${SEND_FILE_DIR}
   redis:
     image: 'redis:alpine'
     restart: always