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diff --git a/doc/manual/src/command-ref/env-common.md b/doc/manual/src/command-ref/env-common.md
index 03016dba7..c670d82b8 100644
--- a/doc/manual/src/command-ref/env-common.md
+++ b/doc/manual/src/command-ref/env-common.md
@@ -81,6 +81,11 @@ Most Nix commands interpret the following environment variables:
Overrides the location of the system Nix configuration directory
(default `prefix/etc/nix`).
+ - `NIX_CONFIG`
+ Applies settings from Nix configuration from the environment.
+ The content is treated as if it was read from a Nix configuration file.
+ Settings are separated by the newline character.
+
- `NIX_USER_CONF_FILES`
Overrides the location of the user Nix configuration files to load
from (defaults to the XDG spec locations). The variable is treated