diff --git a/site/download.md b/site/download.md
index 65854980e..2e6e1432e 100644
--- a/site/download.md
+++ b/site/download.md
@@ -27,7 +27,7 @@ but they can be out of date or incomplete.
 | Fedora, RHEL:   | **`sudo dnf install hledger`**
 | Gentoo:              | **`sudo layman -a haskell && sudo emerge hledger hledger-ui hledger-web`**
 | Void Linux:          | **`xbps-install -S hledger hledger-ui hledger-web hledger-api`**
-| NixOS:               | **`nix-env -iA nixpkgs.haskellPackages.hledger \`<br>&nbsp;&nbsp;`nixpkgs.haskellPackages.hledger-ui \`<br>&nbsp;&nbsp;`nixpkgs.haskellPackages.hledger-web`**
+| NixOS:               | **`nix-env -iA nixpkgs.haskellPackages.hledger \`<br>&nbsp;&nbsp;`nixpkgs.haskellPackages.hledger-ui \`<br>&nbsp;&nbsp;`nixpkgs.haskellPackages.hledger-web`** (problems building hledger-ui on MacOS, [please help](https://github.com/simonmichael/hledger/issues/613)
 | Sandstorm:           | **[hledger-web Sandstorm app](https://apps.sandstorm.io/app/8x12h6p0x0nrzk73hfq6zh2jxtgyzzcty7qsatkg7jfg2mzw5n90) -> demo** (get a hledger-web server in 3 clicks. Features needed, [please help](https://github.com/simonmichael/hledger/issues/425))