diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 1e1aeca620b0dcdffcbae9452117fb41af9c1c64..73faf6ce7d6af55557d4e3161e991a2bd57963ae 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -44,7 +44,7 @@ so that documentation built within GHC can benefit from it.
 
 #### Using `cabal`
 
-Requires cabal `>= 3.4` and GHC `== 9.0`:
+Building the `ghc-9.0` branch requires cabal `>= 3.4` and GHC `== 9.0`:
 
 ```bash
 cabal v2-build all --enable-tests