I'm following the code from this wiki entry:

http://our.umbraco.org/wiki/reference/umbracolibrary/updatedocumentcache

//Create new DocumentObject
Document doc = new Document(id);
//Mark the document for publish under Admin account
doc.Publish(new User(0));
//Publish the document by Updating umbraco.config file 
library.UpdateDocumentCache(doc.Id);

The scenario where I am not seeing it update immediately is when attaching a Comment to an Item in the CMS and it is the first comment to be attached, which creates a node for the comments as well as the comment itself. The comment is not immediately retrievable from the Cache. It works fine for all subsequent comments though.

Any ideas?