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diff --git a/docs/ENVIRONMENT.md b/docs/ENVIRONMENT.md
index ef0141e1a6..9f5666c019 100644
--- a/docs/ENVIRONMENT.md
+++ b/docs/ENVIRONMENT.md
@@ -54,6 +54,10 @@ All tools:
* `$SYSTEMD_SYSROOT_FSTAB` — if set, use this path instead of
`/sysroot/etc/fstab`. Only useful for debugging `systemd-fstab-generator`.
+* `$SYSTEMD_SYSFS_CHECK` — takes a boolean. If set, overrides sysfs container
+ detection that ignores `/dev/` entries in fstab. Only useful for debugging
+ `systemd-fstab-generator`.
+
* `$SYSTEMD_CRYPTTAB` — if set, use this path instead of `/etc/crypttab`. Only
useful for debugging. Currently only supported by
`systemd-cryptsetup-generator`.