add note about DO bindings in the getPlatformProxy docs

content/workers/wrangler/api.md

@@ -352,6 +352,14 @@ The bindings supported by `getPlatformProxy` are:
 
  * [Durable Object bindings](/workers/configuration/bindings/#durable-object-bindings)
 
+    * To use a Durable Object binding with `getPlatformProxy`, you need to always specify a `script_name` for it
+    and have the target worker run in a separate terminal via `wrangler dev`.
+
+      For example in your project's `wrangler.toml` file you have a Durable Object with certain `class_name`
+      and `script_name` set to `"my-worker"`. The same exact `class_name` is also used by a Durable Object binding
+      in your `my-worker` worker, and you are running the worker via `wrangler dev`.
+      Calling `getPlatformProxy` will then successfully generate a proxy to the Durable Object defined in the `my-worker` worker.
+
  * [R2 bucket bindings](/workers/configuration/bindings/#r2-bucket-bindings)
 
  * [Queue bindings](/workers/configuration/bindings/#queue-bindings)