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-rw-r--r--pkgs/development/compilers/ghcjs-ng/README.md7
1 files changed, 4 insertions, 3 deletions
diff --git a/pkgs/development/compilers/ghcjs-ng/README.md b/pkgs/development/compilers/ghcjs-ng/README.md
index 3e1598c83b05..99ad980c965e 100644
--- a/pkgs/development/compilers/ghcjs-ng/README.md
+++ b/pkgs/development/compilers/ghcjs-ng/README.md
@@ -12,9 +12,10 @@ Updating
 ---
 
 ```
-$ nix-prefetch-git https://github.com/ghcjs/ghcjs --rev refs/heads/ghc-8.2 \
+$ nix-prefetch-git https://github.com/ghcjs/ghcjs --rev refs/heads/ghc-8.4 \
   | jq '{ url, rev, fetchSubmodules, sha256 }' \
-  > 8.2/git.json
-$ cat $(nix-build ../../../.. -A haskell.compiler.ghcjs82.genStage0 --no-out-link) > 8.2/stage0.nix
+  > 8.4/git.json
+$ cat $(nix-build ../../../.. -A haskell.compiler.ghcjs82.genStage0 --no-out-link) > 8.4/stage0.nix
+$ cabal2nix --compiler ghcjs git://github.com/ghcjs/ghcjs-base > ghcjs-base.nix
 ```