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diff --git a/docs/ENVIRONMENT.md b/docs/ENVIRONMENT.md
index aba9ede259..9a824820da 100644
--- a/docs/ENVIRONMENT.md
+++ b/docs/ENVIRONMENT.md
@@ -369,6 +369,11 @@ disk images with `--image=` or similar:
directores in `/usr/lib/`, `/run`, …) or passed to the kernel for validation
against its built-in certificates.
+* `$SYSTEMD_LOOP_DIRECT_IO` – takes a boolean, which controls whether to enable
+ LO_FLAGS_DIRECT_IO (i.e. direct IO + asynchronous IO) on loopback block
+ devices when opening them. Defaults to on, set this to "0" to disable this
+ feature.
+
`systemd-cryptsetup`:
* `$SYSTEMD_CRYPTSETUP_USE_TOKEN_MODULE` – takes a boolean, which controls