Add Note to Document
When you add a note to a document, it appears in the Note column on the History/Notes tab of the Document Information dialog box and in the SolidWorks Explorer client.
You must be the owner of the document to add a note.
To add a note to a document:
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Right-click a document in the vault view and select Add Note. In the SolidWorks Explorer client, you can also select a document and click Add Note 
on the Mini Toolbar.
The Add Note to Document dialog box displays information about the document and lists any reference documents.
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To add the note to references, select the references in the Select references to add note to window.
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Under Additional information, type a note into the Enter note box.
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Click Add Note.
You can also Output to file from this dialog box.