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diff --git a/docs/ENVIRONMENT.md b/docs/ENVIRONMENT.md
index d55bcaf802..302ca67b57 100644
--- a/docs/ENVIRONMENT.md
+++ b/docs/ENVIRONMENT.md
@@ -488,6 +488,12 @@ disk images with `--image=` or similar:
devices when opening them. Defaults to on, set this to "0" to disable this
feature.
+* `$SYSTEMD_ALLOW_USERSPACE_VERITY` — takes a boolean, which controls whether
+ to consider the userspace Verity public key store in `/etc/verity.d/` (and
+ related directories) to authenticate signatures on Verity hashes of disk
+ images. Defaults to true, i.e. userspace signature validation is allowed. If
+ false, authentication can be done only via the kernel's internal keyring.
+
`systemd-cryptsetup`:
* `$SYSTEMD_CRYPTSETUP_USE_TOKEN_MODULE` – takes a boolean, which controls