diff --git a/shake/README.mkd b/shake/README.mkd
index 9d578e1aa0c58f810451eaab3b9ed406a9b05643..76740a5fbcfb1f1c9c21b19674bbfe0164b3d535 100644
--- a/shake/README.mkd
+++ b/shake/README.mkd
@@ -108,7 +108,7 @@ supports this conveniently via the `--head` flag.
 First, update the `head.hackage` package index with:
 
 ```
-cabal v2-update --project-file=nofib.head head.hackage.ghc.haskell.org
+cabal v2-update --project-file=cabal.project.head-hackage head.hackage.ghc.haskell.org
 ```
 
 Now run `nofib-run` as usual, adding the `--head` flag to your command-line.