diff --git a/.env.example b/.env.example
index 0f3d5f0a..47eb9f70 100644
--- a/.env.example
+++ b/.env.example
@@ -1,7 +1,11 @@
 # Useful config options
+
+# Library root can either be an absolute path or a relative path to your docker-compose.yml file.
 LIBRARY_ROOT=./video
 CACHE_ROOT=/tmp/kyoo_cache
 LIBRARY_LANGUAGES=en
+# Hardware transcoding (equivalent of --profile docker compose option).
+# COMPOSE_PROFILES= # vaapi or qsv or nvidia
 
 # A pattern (regex) to ignore video files.
 LIBRARY_IGNORE_PATTERN=.*/[dD]ownloads?/.*
diff --git a/docker-compose.dev.yml b/docker-compose.dev.yml
index 65607171..4e08f835 100644
--- a/docker-compose.dev.yml
+++ b/docker-compose.dev.yml
@@ -16,7 +16,7 @@ x-transcoder: &transcoder-base
     - ./.env
   volumes:
     - ./transcoder:/app
-    - ${LIBRARY_ROOT}:/video
+    - ${LIBRARY_ROOT}:/video:ro
     - ${CACHE_ROOT}:/cache
     - metadata:/metadata
 
@@ -70,7 +70,7 @@ services:
     environment:
       - KYOO_URL=${KYOO_URL:-http://back:5000}
     volumes:
-      - ${LIBRARY_ROOT}:/video
+      - ${LIBRARY_ROOT}:/video:ro
 
   transcoder:
     <<: *transcoder-base
diff --git a/docker-compose.prod.yml b/docker-compose.prod.yml
index d85edf73..01ae4005 100644
--- a/docker-compose.prod.yml
+++ b/docker-compose.prod.yml
@@ -10,7 +10,7 @@ x-transcoder: &transcoder-base
   env_file:
     - ./.env
   volumes:
-    - ${LIBRARY_ROOT}:/video
+    - ${LIBRARY_ROOT}:/video:ro
     - ${CACHE_ROOT}:/cache
     - metadata:/metadata
 
@@ -47,7 +47,7 @@ services:
     environment:
       - KYOO_URL=${KYOO_URL:-http://back:5000}
     volumes:
-      - ${LIBRARY_ROOT}:/video
+      - ${LIBRARY_ROOT}:/video:ro
 
   transcoder:
     <<: *transcoder-base
diff --git a/docker-compose.yml b/docker-compose.yml
index d85f42c0..e3fc9ee5 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -10,7 +10,7 @@ x-transcoder: &transcoder-base
   env_file:
     - ./.env
   volumes:
-    - ${LIBRARY_ROOT}:/video
+    - ${LIBRARY_ROOT}:/video:ro
     - ${CACHE_ROOT}:/cache
     - metadata:/metadata
 
@@ -46,7 +46,7 @@ services:
     environment:
       - KYOO_URL=${KYOO_URL:-http://back:5000}
     volumes:
-      - ${LIBRARY_ROOT}:/video
+      - ${LIBRARY_ROOT}:/video:ro
 
   transcoder:
     <<: *transcoder-base