diff --git a/README.md b/README.md
index 4d221f3..b749488 100644
--- a/README.md
+++ b/README.md
@@ -141,6 +141,14 @@ env.assert(
 );
 ```
 
+#### Adding to the environment
+
+```javascript
+env.set('NEW_ENV_VAR', 'newVal');
+process.env.NEW_ENV_VAR // 'newVal'
+env.get('NEW_ENV_VAR'); // 'newVal'
+```
+
 ### AWS Credentials
 
 ```javascript
diff --git a/package.json b/package.json
index d7ce904..26023df 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "good-env",
-  "version": "7.5.0",
+  "version": "7.6.0",
   "description": "Better environment variable handling for Twelve-Factor node apps",
   "main": "src/index.js",
   "scripts": {
diff --git a/src/index.d.ts b/src/index.d.ts
index b4401a4..a4760c1 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -1,4 +1,5 @@
 declare module "good-env" {
+  export const set: (key: string, value: string) => void;
   /**
    * @description Tell Good Env to go to secrets manager, grab the object under the specified secretId and merge it with the
    * environment.
diff --git a/src/index.js b/src/index.js
index 204d4f4..7127e86 100644
--- a/src/index.js
+++ b/src/index.js
@@ -17,6 +17,10 @@ let store = { ...process.env };
 
 module.exports = Object
   .create({
+    set (key, value) {
+      process.env[key] = value;
+      store[key] = value;
+    },
     async use (awsSecretsManager, secretId) {
       const { SecretsManagerClient, GetSecretValueCommand } = awsSecretsManager;
       const client = new SecretsManagerClient({
diff --git a/test/test.js b/test/test.js
index 4905244..9aff442 100644
--- a/test/test.js
+++ b/test/test.js
@@ -9,6 +9,13 @@ const {
   SecretsManagerClientHappy
 } = require('./mocks');
 
+test('it adds an env var', (t) => {
+  env.set('NEW_ENV_VAR', 'bar');
+  t.equals(process.env.NEW_ENV_VAR, 'bar');
+  t.equals(env.get('NEW_ENV_VAR'), 'bar');
+  t.end();
+});
+
 test('it throws when no secretId is given when attempting to use secretsManager', async (t) => {
   const awsSecretsManager = { SecretsManagerClient: SecretsManagerClientHappy, GetSecretValueCommand };