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-rw-r--r--tools/nixery/docs/src/under-the-hood.md4
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/nixery/docs/src/under-the-hood.md b/tools/nixery/docs/src/under-the-hood.md
index 3791707b1c..6b5e5e9bbf 100644
--- a/tools/nixery/docs/src/under-the-hood.md
+++ b/tools/nixery/docs/src/under-the-hood.md
@@ -51,7 +51,8 @@ does not allow uppercase characters, so the Nix code will translate something
 like `haskellpackages` (lowercased) to the correct attribute name.
 
 After identifying all contents, Nix determines the contents of each layer while
-optimising for the best possible cache efficiency.
+optimising for the best possible cache efficiency (see the [layering design
+doc][] for details).
 
 Finally it builds each layer, assembles the image manifest as JSON structure,
 and yields this manifest back to the web server.
@@ -103,3 +104,4 @@ to run the image produced by Nixery.
 
 [gcs]: https://cloud.google.com/storage/
 [signed URLs]: https://cloud.google.com/storage/docs/access-control/signed-urls
+[layering design doc]: https://storage.googleapis.com/nixdoc/nixery-layers.html