diff --git a/.env.example b/.env.example
index c1e2cdf..6a46de1 100644
--- a/.env.example
+++ b/.env.example
@@ -37,8 +37,12 @@ POSTGRES_IMAGE=postgres:17.11-alpine
 # /var/lib/docker. To use a larger disk, give an absolute path to a directory ON it - a
 # subdirectory, never the mount point itself, which on ext4 holds lost+found and makes PostgreSQL
 # refuse to start. Create the directories and set their owner first; see "Storing the data on
-# another disk" in the README.
-#   POSTGRES_DATA_PATH=/mnt/bigdisk/postgres    owner 70:70, mode 700
-#   MINIO_DATA_PATH=/mnt/bigdisk/minio          owner 1000:1000
+# another disk" in the README. Only the path goes in the value:
+#   POSTGRES_DATA_PATH=/mnt/bigdisk/postgres
+#   MINIO_DATA_PATH=/mnt/bigdisk/minio
+# The owner is set on the host directory, by number, because that is what the container's user
+# is: the user inside the container, not whoever runs docker.
+#   sudo chown 70:70 /mnt/bigdisk/postgres && sudo chmod 700 /mnt/bigdisk/postgres
+#   sudo chown 1000:1000 /mnt/bigdisk/minio
 POSTGRES_DATA_PATH=
 MINIO_DATA_PATH=