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-rw-r--r--tools/nixery/README.md1
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diff --git a/tools/nixery/README.md b/tools/nixery/README.md
index 3bc6df845a7f..3026451c74e0 100644
--- a/tools/nixery/README.md
+++ b/tools/nixery/README.md
@@ -83,6 +83,7 @@ variables:
   for building
 * `NIX_TIMEOUT`: Number of seconds that any Nix builder is allowed to run
   (defaults to 60
+* `NIX_POPULARITY_URL`: URL to a file containing popularity data for the package set (see `popcount/`)
 * `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