diff --git a/API.md b/API.md
index 510bcff..b91818b 100644
--- a/API.md
+++ b/API.md
@@ -252,6 +252,7 @@ for details.
     -   `options.accessKeyId` **[string]** credentials for the client to utilize
     -   `options.secretAccessKey` **[string]** credentials for the client to utilize
     -   `options.sessionToken` **[string]** credentials for the client to utilize
+    -   `options.credentials` **[AWS.Credentials]** [AWS.Credentials](https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/Credentials.html) object for the client to utilize
     -   `options.logger` **[object]** a writable stream for detailed logging from the aws-sdk. See [constructor docs for details](http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB.html#constructor-property).
     -   `options.maxRetries` **[number]** number of times to retry on retryable errors. See [constructor docs for details](http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB.html#constructor-property).
 
diff --git a/index.js b/index.js
index 5af85ac..7cb0786 100644
--- a/index.js
+++ b/index.js
@@ -22,6 +22,7 @@ module.exports = Dyno;
  * @param {string} [options.accessKeyId] - credentials for the client to utilize
  * @param {string} [options.secretAccessKey] - credentials for the client to utilize
  * @param {string} [options.sessionToken] - credentials for the client to utilize
+ * @param {AWS.Credentials} [options.credentials] - an AWS.Credentials object for the client to utilize
  * @param {object} [options.logger] - a writable stream for detailed logging from the aws-sdk. See [constructor docs for details](http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB.html#constructor-property).
  * @param {number} [options.maxRetries] - number of times to retry on retryable errors. See [constructor docs for details](http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB.html#constructor-property).
  * @returns {client} a dyno client
@@ -70,6 +71,7 @@ function Dyno(options) {
     accessKeyId: options.accessKeyId,
     secretAccessKey: options.secretAccessKey,
     sessionToken: options.sessionToken,
+    credentials: options.credentials,
     logger: options.logger,
     maxRetries: options.maxRetries
   };
diff --git a/package.json b/package.json
index f6f7586..6439762 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@mapbox/dyno",
-  "version": "1.4.1",
+  "version": "1.5.0",
   "description": "Simple DynamoDB client",
   "main": "index.js",
   "scripts": {