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diff --git a/tools/nixery/README.md b/tools/nixery/README.md
index cdae23bc4b72..3bc6df845a7f 100644
--- a/tools/nixery/README.md
+++ b/tools/nixery/README.md
@@ -81,6 +81,8 @@ variables:
   locally configured SSH/git credentials)
 * `NIXERY_PKGS_PATH`: A local filesystem path containing a Nix package set to use
   for building
+* `NIX_TIMEOUT`: Number of seconds that any Nix builder is allowed to run
+  (defaults to 60
 * `GCS_SIGNING_KEY`: A Google service account key (in PEM format) that can be
   used to sign Cloud Storage URLs
 * `GCS_SIGNING_ACCOUNT`: Google service account ID that the signing key belongs