diff --git a/README.md b/README.md
index 2ad1cc8..fb0c63a 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
 # array-string-map
+
 ![node-current](https://img.shields.io/node/v/array-string-map)
 [![npm](https://img.shields.io/npm/v/array-string-map)](https://www.npmjs.com/package/array-string-map)
 [![npm](https://img.shields.io/npm/dt/array-string-map)](https://www.npmjs.com/package/array-string-map)
@@ -9,4 +10,29 @@ A Map that internally encodes Arrays to strings so that two Arrays with the same
 
 ## Motivation
 
-I was using a Map to store array values, and I kept on running into a bug where I could not get those values back. I got fed up, and then after some Googling, realized that array lookups will not work when two different arrays with the same elements are used (such as when I use array literal syntax to create them). My solution was to encode the values as string keys.
+I was using a Map to store array values, and I kept on running into a bug where I could not get those values back. I got
+fed up, and then after some Googling, realized that array lookups will not work when two different arrays with the same
+elements are used (such as when I use array literal syntax to create them). My solution was to encode the values as
+string keys.
+
+## Usage
+
+ESM modules or TypeScript scripts can just import the normal way, such as:
+
+```ts
+import ArrayStringMap from 'array-string-map'
+```
+
+However, for CommonJS modules, you need to use the `require` function, such as:
+
+```js
+const {default: ArrayStringMap} = require("./arrayStringMap")
+```
+
+## API
+
+### ArrayStringMap
+
+A class that implements the [Map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map)
+interface. All methods that can be used on a Map are available on the ArrayStringMap.
+
diff --git a/arrayStringMap.test.ts b/arrayStringMap.test.ts
index 021656d..dfeb30a 100644
--- a/arrayStringMap.test.ts
+++ b/arrayStringMap.test.ts
@@ -1,5 +1,5 @@
 import { assert } from "chai"
-import ArrayStringMap from "./arrayStringMap.js"
+import ArrayStringMap from "./arrayStringMap"
 
 type TwoNumberArray = [number, number]
 
diff --git a/package-lock.json b/package-lock.json
index 7c72f7f..b344849 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,19 +1,23 @@
 {
   "name": "array-string-map",
-  "version": "1.0.1",
+  "version": "2.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "array-string-map",
-      "version": "1.0.1",
+      "version": "2.0.0",
       "license": "GNU General Public License v3.0",
       "devDependencies": {
         "@types/chai": "^4.3.0",
         "@types/mocha": "^9.0.0",
+        "@types/node": "^17.0.0",
         "chai": "^4.3.4",
         "mocha": "^9.1.3",
         "typescript": "^4.5.4"
+      },
+      "engines": {
+        "node": ">=8.X.X"
       }
     },
     "node_modules/@types/chai": {
@@ -28,6 +32,12 @@
       "integrity": "sha512-scN0hAWyLVAvLR9AyW7HoFF5sJZglyBsbPuHO4fv7JRvfmPBMfp1ozWqOf/e4wwPNxezBZXRfWzMb6iFLgEVRA==",
       "dev": true
     },
+    "node_modules/@types/node": {
+      "version": "17.0.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-17.0.0.tgz",
+      "integrity": "sha512-eMhwJXc931Ihh4tkU+Y7GiLzT/y/DBNpNtr4yU9O2w3SYBsr9NaOPhQlLKRmoWtI54uNwuo0IOUFQjVOTZYRvw==",
+      "dev": true
+    },
     "node_modules/@ungap/promise-all-settled": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
@@ -1027,6 +1037,12 @@
       "integrity": "sha512-scN0hAWyLVAvLR9AyW7HoFF5sJZglyBsbPuHO4fv7JRvfmPBMfp1ozWqOf/e4wwPNxezBZXRfWzMb6iFLgEVRA==",
       "dev": true
     },
+    "@types/node": {
+      "version": "17.0.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-17.0.0.tgz",
+      "integrity": "sha512-eMhwJXc931Ihh4tkU+Y7GiLzT/y/DBNpNtr4yU9O2w3SYBsr9NaOPhQlLKRmoWtI54uNwuo0IOUFQjVOTZYRvw==",
+      "dev": true
+    },
     "@ungap/promise-all-settled": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
diff --git a/package.json b/package.json
index d9fc8ec..c126d61 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "array-string-map",
   "version": "2.0.0",
   "description": "A Map that internally encodes Arrays to strings so that two Arrays with the same elements will return the same item.",
-  "type": "module",
+  "type": "commonjs",
   "main": "arrayStringMap.js",
   "types": "arrayStringMap.d.ts",
   "scripts": {
@@ -29,6 +29,7 @@
   "devDependencies": {
     "@types/chai": "^4.3.0",
     "@types/mocha": "^9.0.0",
+    "@types/node": "^17.0.0",
     "chai": "^4.3.4",
     "mocha": "^9.1.3",
     "typescript": "^4.5.4"
diff --git a/tsconfig.json b/tsconfig.json
index ea61249..ff2d5e1 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "module": "esnext",
+    "module": "commonjs",
     "target": "es2019",
     "strict": true,
     "allowJs": true,