diff --git a/README.md b/README.md
index 35eab1cc..e5d1336a 100644
--- a/README.md
+++ b/README.md
@@ -1,35 +1,44 @@
 # Squiggle
 
-This is an experiment DSL/language for making probabilistic estimates.
+This is an experiment DSL/language for making probabilistic estimates. The full story can be found [here](https://www.lesswrong.com/s/rDe8QE5NvXcZYzgZ3). 
 
 This monorepo has several packages that can be used for various purposes. All 
 the packages can be found in `packages`.
 
-`@quri/squiggle-lang` in `packages/squiggle-lang` contains the core language, particularly
+- `@quri/squiggle-lang` in `packages/squiggle-lang` contains the core language, particularly
 an interface to parse squiggle expressions and return descriptions of distributions
 or results.
-
-`@quri/squiggle-components` in `packages/components` contains React components that
+- `@quri/squiggle-components` in `packages/components` contains React components that
 can be passed squiggle strings as props, and return a presentation of the result
 of the calculation.
-
-`@quri/playground` in `packages/playground` contains a website for a playground
+- `@quri/playground` in `packages/playground` contains a website for a playground
 for squiggle. This website is hosted at `playground.squiggle-language.com`
-
-`@quri/squiggle-website` in `packages/website` The main descriptive website for squiggle,
+- `@quri/squiggle-website` in `packages/website` The main descriptive website for squiggle,
 it is hosted at `squiggle-language.com`.
 
 The playground depends on the components library which then depends on the language.
 This means that if you wish to work on the components library, you will need
-to package the language, and for the playground to work, you will need to package
+to build and bundle the language, and for the playground to work, you will need to build and bundle
 the components library and the playground.
 
 # Develop
 
-For any project in the repo, begin by running `yarn` in the top level 
+For any project in the repo, begin by running `yarn` in the top level (TODO: is this true?) 
 
 ``` sh
 yarn
 ```
 
 See `packages/*/README.md` to work with whatever project you're interested in. 
+
+## `codium` for `rescript` 
+
+If you have `nix` installed with `flakes` enabled, you can build a `codium` in this repo for `rescript` development, if you don't want to pollute your machine's global editor with another mode/extension. 
+
+``` sh
+nix develop
+codium 
+```
+
+# Contributing
+See `CONTRIBUTING.md`. 
diff --git a/flake.nix b/flake.nix
index e803bae7..e75cded9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -41,6 +41,9 @@
           defaultShell = pkgs.mkShell {
             buildInputs = with pkgs; [
               yarn
+              yarn2nix
+              npm
+              nodejs
               (pkgs.vscode-with-extensions.override {
                   vscode = pkgs.vscodium;
                   vscodeExtensions = pkgs.vscode-utils.extensionsFromVscodeMarketplace [
@@ -62,6 +65,24 @@
                       version = "4.7.20220323";
                       sha256 = "sha256-mjiBCyg5As/XAU9I5k6jEZWGJA3P6P5o1roe2bS7aUI=";
                     }
+                    {
+                      name = "nix-ide";
+                      publisher = "jnoortheen";
+                      version = "0.1.20";
+                      sha256 = "sha256-Q6X41I68m0jaCXaQGEFOoAbSUrr/wFhfCH5KrduOtZo=";
+                    }
+                    {
+                      name = "json";
+                      publisher = "ZainChen";
+                      version = "2.0.2";
+                      sha256 = "sha256-nC3Q8KuCtn/jg1j/NaAxWGvnKe/ykrPm2PUjfsJz8aI=";
+                    }
+                    {
+                      name = "prettier-vscode";
+                      publisher = "esbenp";
+                      version = "9.3.0";
+                      sha256 = "sha256-hJgPjWf7a8+ltjmXTK8U/MwqgIZqBjmcCfHsAk2G3PA=";
+                    }
                   ];
               })
             ];