Update development/comfyui-server/api-key-integration.mdx

Author: mintlify[bot]

development/comfyui-server/api-key-integration.mdx

@@ -15,6 +15,10 @@ Then run everything together by simply sending the prompt to the Comfy webserver
 
 This is helpful for users who want to use Comfy as a backend service, via the command line, with their own frontend, etc.
 
+<Note>
+**Looking for the registry publish API key?** If you're trying to publish custom nodes to the Comfy Registry, you need a different API key. See the [Publishing Nodes](/registry/publishing#create-an-api-key-for-publishing) documentation for details on creating a registry publish API key.
+</Note>
+
 ## Prerequisites
 
 Using API Key to call ComfyUI's built-in API nodes requires: