@@ -22,7 +22,31 @@ You need to add the following sections to `/etc/nix/nix.conf` or, if you are a t
2222
2323```
2424trusted-public-keys = [...] hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= [...]
25−substituters = [...] https://hydra.iohk.io [...]
25+substituters = [...] https://cache.iog.io [...]
26+```
27+
28+If you're running NixOS, you need to add/update the following in your `/etc/nixos/configuration.nix` files instead.
29+
30+```
31+# Binary Cache for Haskell.nix
32+nix.settings.trusted-public-keys = [
33+ "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="
34+];
35+nix.settings.substituters = [
36+ "https://cache.iog.io"
37+];
38+```
39+
40+NixOS-21.11 and older use slightly different settings.
41+
42+```
43+# Binary Cache for Haskell.nix
44+nix.binaryCachePublicKeys = [
45+ "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="
46+];
47+nix.binaryCaches = [
48+ "https://cache.iog.io"
49+];
2650```
2751
2852This can be tricky to get setup properly. If you're still having trouble getting cache hits, consult the corresponding [troubleshooting section](../troubleshooting.md#why-am-i-building-ghc).