diff --git a/packages/strapi-provider-upload-aws-s3/README.md b/packages/strapi-provider-upload-aws-s3/README.md
index 2df1205e35..c6f6313204 100644
--- a/packages/strapi-provider-upload-aws-s3/README.md
+++ b/packages/strapi-provider-upload-aws-s3/README.md
@@ -4,22 +4,28 @@
 
 Your configuration is passed down to the provider. (e.g: `new AWS.S3(config)`). You can see the complete list of options [here](https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#constructor-property)
 
+See the [using a provider](https://strapi.io/documentation/v3.x/plugins/upload.html#using-a-provider) documentation for information on installing and using a provider. And see the [environment variables](https://strapi.io/documentation/v3.x/concepts/configurations.html#environment-variables) for setting and using environment variables in your configs.
+
 **Example**
 
-`./extensions/upload/config/settings.json`
+`./config/plugins.js`
 
-```json
-{
-  "provider": "aws-s3",
-  "providerOptions": {
-    "accessKeyId": "dev-key",
-    "secretAccessKey": "dev-secret",
-    "region": "aws-region",
-    "params": {
-      "Bucket": "my-bucket"
+```js
+module.exports = ({ env }) => ({
+  // ...
+  upload: {
+    provider: "aws-s3",
+    providerOptions: {
+      accessKeyId: env('AWS_ACCESS_KEY_ID'),
+      secretAccessKey: env('AWS_ACCESS_SECRET'),
+      region: env('AWS_REGION'),
+      params: {
+        Bucket: env('AWS_BUCKET')
+      }
     }
-  }
-}
+  },
+  // ...
+});
 ```
 
 ## Resources
diff --git a/packages/strapi-provider-upload-cloudinary/README.md b/packages/strapi-provider-upload-cloudinary/README.md
index 42d4804c29..35da67ff31 100644
--- a/packages/strapi-provider-upload-cloudinary/README.md
+++ b/packages/strapi-provider-upload-cloudinary/README.md
@@ -4,19 +4,25 @@
 
 Your configuration is passed down to the cloudinary configuration. (e.g: `cloudinary.config(config)`). You can see the complete list of options [here](https://cloudinary.com/documentation/cloudinary_sdks#configuration_parameters)
 
+See the [using a provider](https://strapi.io/documentation/v3.x/plugins/upload.html#using-a-provider) documentation for information on installing and using a provider. And see the [environment variables](https://strapi.io/documentation/v3.x/concepts/configurations.html#environment-variables) for setting and using environment variables in your configs.
+
 **Example**
 
-`./extensions/upload/config/settings.json`
+`./config/plugins.js`
 
-```json
-{
-  "provider": "cloudinary",
-  "providerOptions": {
-    "cloud_name": "cloud-name",
-    "api_key": "api-key",
-    "api_secret": "api-secret"
-  }
-}
+```js
+module.exports = ({ env }) => ({
+  // ...
+  upload: {
+    provider: "cloudinary",
+    providerOptions: {
+      cloud_name: env('CLOUDINARY_NAME'),
+      api_key: env('CLOUDINARY_KEY'),
+      api_secret: env('CLOUDINARY_SECRET')
+    }
+  },
+  // ...
+});
 ```
 
 ## Resources
diff --git a/packages/strapi-provider-upload-rackspace/README.md b/packages/strapi-provider-upload-rackspace/README.md
index 40f0dc711f..3dc55f031f 100644
--- a/packages/strapi-provider-upload-rackspace/README.md
+++ b/packages/strapi-provider-upload-rackspace/README.md
@@ -4,19 +4,25 @@
 
 Your configuration is passed down to the client initialization. (e.g: `createClient(config)`). The implementation is based on the package `pkgcloud`. You can read the docs [here](https://github.com/pkgcloud/pkgcloud#storage).
 
+See the [using a provider](https://strapi.io/documentation/v3.x/plugins/upload.html#using-a-provider) documentation for information on installing and using a provider. And see the [environment variables](https://strapi.io/documentation/v3.x/concepts/configurations.html#environment-variables) for setting and using environment variables in your configs.
+
 **Example**
 
-`./extensions/upload/config/settings.json`
+`./config/plugins.js`
 
-```json
-{
-  "provider": "rackspace",
-  "providerOptions": {
-    "username": "user-name",
-    "apiKey": "api-key",
-    "region": "IAD"
-  }
-}
+```js
+module.exports = ({ env }) => ({
+  // ...
+  upload: {
+    provider: "rackspace",
+    providerOptions: {
+      username: env('RACKSPACE_USERNAME'),
+      apiKey: env('RACKSPACE_KEY'),
+      region: env('RACKSPACE_REGION')
+    }
+  },
+  // ...
+});
 ```
 
 ## Resources