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-rw-r--r--docs/ENVIRONMENT.md3
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diff --git a/docs/ENVIRONMENT.md b/docs/ENVIRONMENT.md
index 961601c72e..8068d0d33c 100644
--- a/docs/ENVIRONMENT.md
+++ b/docs/ENVIRONMENT.md
@@ -191,6 +191,9 @@ All tools:
expected format is six groups of two hexadecimal digits separated by colons,
e.g. `SYSTEMD_VMSPAWN_NETWORK_MAC=12:34:56:78:90:AB`
+* `$SYSTEMD_VMSPAWN_QEMU_EXTRA=…` – may contain additional command line
+ arguments to append the qemu command line.
+
`systemd-logind`:
* `$SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK=1` — if set, report that