From the Task Actions page, you can add comments about any task and also attach references.
To add a reference:
In the References section, select Actions, then Add, or click the Add button.
From the Type list, select a type:
Repository File
From the document repository file list, select the file, and click OK.
Local File
Enter a name, click Browse to select and attach the file, and click OK.
URL
Enter a URL name, then enter the URL, for example: Oracle, http://www.oracle.com, and click OK.