diff --git a/README_API.md b/README_API.md
index cd37a90..49ee045 100644
--- a/README_API.md
+++ b/README_API.md
@@ -222,6 +222,13 @@ IMPORTANT! If you provide a function you must also make sure to call `monarch.on
 * `fn_or_url` (function) - The function to call or URL to send message to
 
 
+## monarch.has_missing_resources(screen_id)
+Check if a screen has any missing resources. If the screen is loaded by a collection proxy with Load Dynamically this will use `collectionproxy.missing_resources()`. For other cases this function will always return false.
+
+**RETURN**
+* `result` (boolean) - true if the screen has missing resources
+
+
 ## monarch.debug()
 Enable verbose logging of the internals of Monarch.