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-rw-r--r--tools/nixery/README.md4
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/nixery/README.md b/tools/nixery/README.md
index e0e634c3cb18..bcb8e40ec794 100644
--- a/tools/nixery/README.md
+++ b/tools/nixery/README.md
@@ -87,6 +87,10 @@ variables:
   locally configured SSH/git credentials)
 * `NIXERY_PKGS_PATH`: A local filesystem path containing a Nix package set to use
   for building
+* `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
+  to
 
 ## Roadmap