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diff --git a/docs/ENVIRONMENT.md b/docs/ENVIRONMENT.md
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@@ -316,3 +316,22 @@ fuzzers:
Note that is may be also useful to set `$SYSTEMD_LOG_LEVEL`, since all logging
is suppressed by default.
+
+systemd-importd:
+
+* `SYSTEMD_IMPORT_BTRFS_SUBVOL` – takes a boolean, which controls whether to
+ prefer creating btrfs subvolumes over plain directories for machine
+ images. Has no effect on non-btrfs file systems where subvolumes are not
+ available anyway. If not set, defaults to true.
+
+* `SYSTEMD_IMPORT_BTRFS_QUOTA` – takes a boolean, which controls whether to set
+ up quota automatically for created btrfs subvolumes for machine images. If
+ not set, defaults to true. Has no effect if machines are placed in regular
+ directories, because btrfs subvolumes are not supported or disabled. If
+ enabled, the quota group of the subvolume is automatically added to a
+ combined quota group for all such machine subvolumes.
+
+* `SYSTEMD_IMPORT_SYNC` – takes a boolean, which controls whether to
+ synchronize images to disk after installing them, before completing the
+ operation. If not set, defaults to true. If disabled installation of images
+ will be quicker, but not as safe.