diff --git a/docker/photoprism/arm64/docker-compose.yml b/docker/photoprism/arm64/docker-compose.yml
index 6433bb501..340c69056 100644
--- a/docker/photoprism/arm64/docker-compose.yml
+++ b/docker/photoprism/arm64/docker-compose.yml
@@ -49,6 +49,7 @@ services:
       PHOTOPRISM_THUMB_SIZE: 2048 # Default thumbnail size limit (default 2048, min 720, max 3840)
       # PHOTOPRISM_THUMB_SIZE: 3840 # For retina screens (requires more storage)
       PHOTOPRISM_THUMB_LIMIT: 3840 # On-demand thumbnail size limit (default 2048, min 720, max 3840)
+      # PHOTOPRISM_SIDECAR_JSON: true # sync metadata with json sidecar files as used by exiftool
     volumes:
       - "~/Pictures/Originals:/photoprism/originals" # [local path]:[container path]
       - "~/Pictures/Import:/photoprism/import" # [local path]:[container path] (optional)
diff --git a/docker/photoprism/docker-compose.yml b/docker/photoprism/docker-compose.yml
index 62c6a53a0..a503f6de1 100644
--- a/docker/photoprism/docker-compose.yml
+++ b/docker/photoprism/docker-compose.yml
@@ -48,6 +48,7 @@ services:
       PHOTOPRISM_THUMB_SIZE: 2048 # Default thumbnail size limit (default 2048, min 720, max 3840)
       # PHOTOPRISM_THUMB_SIZE: 3840 # For retina screens (requires more storage)
       PHOTOPRISM_THUMB_LIMIT: 3840 # On-demand thumbnail size limit (default 2048, min 720, max 3840)
+      # PHOTOPRISM_SIDECAR_JSON: true # sync metadata with json sidecar files as used by exiftool
     volumes:
       - "~/Pictures/Originals:/photoprism/originals" # [local path]:[container path]
       - "~/Pictures/Import:/photoprism/import" # [local path]:[container path] (optional)