diff --git a/packages/relay-config/README.md b/packages/relay-config/README.md
new file mode 100644
index 0000000000000..ea1a8de43b83f
--- /dev/null
+++ b/packages/relay-config/README.md
@@ -0,0 +1,66 @@
+## Relay Config
+
+**Only works with Relay 12 and below, Relay 13 does not use this format**
+
+Handles the config which would traditionally be passed into the relay-compiler via the CLI command-line, or inside the babel plugin config.
+
+To use this package, first install it: `yarn add relay-config`, then create a `relay.config.js` which includes fields the relay-compiler CLI describes:
+
+```js
+// relay.config.js
+module.exports = {
+  // ...
+  // Configuration options accepted by the `relay-compiler` command-line tool and `babel-plugin-relay`.
+  src: "./src",
+  schema: "./data/schema.graphql",
+  exclude: ["**/node_modules/**", "**/__mocks__/**", "**/__generated__/**"],
+}
+```
+
+Here's the full CLI input reference (as of Relay v12)
+
+```
+relay-compiler --schema <path> --src <path> [--watch]
+
+Options:
+  --schema              Path to schema.graphql or schema.json[string] [required]
+  --src                 Root directory of application code   [string] [required]
+  --include             Directories to include under src
+                                                       [array] [default: ["**"]]
+  --exclude             Directories to ignore under src        [array] [default:
+                 ["**/node_modules/**","**/__mocks__/**","**/__generated__/**"]]
+  --extensions          File extensions to compile (defaults to extensions
+                        provided by the language plugin)                 [array]
+  --verbose             More verbose logging          [boolean] [default: false]
+  --quiet               No output to stdout           [boolean] [default: false]
+  --watchman            Use watchman when not in watch mode
+                                                       [boolean] [default: true]
+  --watch               If specified, watches files and regenerates on changes
+                                                      [boolean] [default: false]
+  --validate            Looks for pending changes and exits with non-zero code
+                        instead of writing to disk    [boolean] [default: false]
+  --persistFunction     An async function (or path to a module exporting this
+                        function) which will persist the query text and return
+                        the id.                                         [string]
+  --persistOutput       A path to a .json file where persisted query metadata
+                        should be saved. Will use the default implementation
+                        (md5 hash) if `persistFunction` is not passed.  [string]
+  --repersist           Run the persist function even if the query has not
+                        changed.                      [boolean] [default: false]
+  --noFutureProofEnums  This option controls whether or not a catch-all entry is
+                        added to enum type definitions for values that may be
+                        added in the future. Enabling this means you will have
+                        to update your application whenever the GraphQL server
+                        schema adds new enum values to prevent it from breaking.
+                                                      [boolean] [default: false]
+  --language            The name of the language plugin used for input files and
+                        artifacts               [string] [default: "javascript"]
+  --artifactDirectory   A specific directory to output all artifacts to. When
+                        enabling this the babel plugin needs `artifactDirectory`
+                        set as well.                                    [string]
+  --customScalars       Mappings from custom scalars in your schema to built-in
+                        GraphQL types, for type emission purposes. (Uses yargs
+                        dot-notation, e.g. --customScalars.URL=String)
+  --eagerESModules      This option enables emitting es modules artifacts.
+                                                      [boolean] [default: false]
+```