diff --git a/README.md b/README.md
index 89628f0694efa19370334826219bfb058e49eeb7..0bd5a896880ed939826a8d6afb21a43ebd479642 100644
--- a/README.md
+++ b/README.md
@@ -9,18 +9,12 @@ This sources much of its information from the
 (BioHaskell)[https://biohaskell.org/] project.
 Horizon is a haskell package set targetting new builds of GHC.
 
-This is the core subset required to bootstrap horizon-gen-nix.
+This package set extends [horizon-platform](https://gitlab.horizon-haskell.net/package-sets/horizon-platform).
 
 ## Package Set Policy
 
-This package set has the following policy:
-
-* GHC will advance as often as possible.
-* Nonversioned locations (git, unversioned tarballs) are permitted to allow
-   GHC to advance.
-* The following packages must always build:
-  * BiobaseTypes
-  * BiobaseXNA
+The following things are always expected to be here:
+- sequence-formats
 
 ## Updating the Package Set
 
@@ -58,12 +52,9 @@ nix-prefetch-git https://gitlab.haskell.org/ghc/ghc --fetch-submodules > ghc.jso
 ## Tweaking & Hacking
 
 If you need to do additional manual overrides to the nix code, such as
-`addPkgconfigDepends`, edit the `configuration/common.nix` overlay, which is
+`addPkgconfigDepends`, edit the `configuration.nix` overlay, which is
 applied over the generated derivations.
 
-If you need to nullify libraries, use the `configuration/hacking.nix` overlay.
-Try to leave a note as to why this library has been nullified.
-
 ## Feedback
 
 To build all packages, run