diff --git a/ads/_config.js b/ads/_config.js
index 75833ba2c8e4..bd37ce0a2806 100644
--- a/ads/_config.js
+++ b/ads/_config.js
@@ -367,6 +367,7 @@ export const adConfig = {
       'https://s.yieldmo.com',
       'https://ads.yieldmo.com',
     ],
+    renderStartImplemented: true,
   },
 
   yieldone: {
diff --git a/ads/yieldmo.md b/ads/yieldmo.md
index 44c6e94cf34b..4cceaba760e1 100644
--- a/ads/yieldmo.md
+++ b/ads/yieldmo.md
@@ -31,4 +31,24 @@ For semantics of configuration, please [contact Yieldmo](https://yieldmo.com/#co
 
 Supported parameters:
 
-- data-ymid
+- `data-ymid`
+
+## Multi-size Ad
+
+Yieldmo implicitly handles rendering different sized ads that are bid to the same placement. No additional configuration is required for the tag.
+
+---
+
+Above the fold ads do not resize, so as not to not disrupt the user experience:
+
+![](http://test.yieldmo.com.s3.amazonaws.com/amp-demo/big-notResized.gif)
+![](http://test.yieldmo.com.s3.amazonaws.com/amp-demo/small-notResized.gif)
+
+---
+
+Below the fold, ads resize:
+
+![](http://test.yieldmo.com.s3.amazonaws.com/amp-demo/big-resized.gif)
+![](http://test.yieldmo.com.s3.amazonaws.com/amp-demo/small-resized.gif)
+
+---