Using the Note tool

The notes that you can add when reviewing a PDF file run the gamut of hidden comments (identified by a note icon), simple text displayed at all times in the document, audio comments that you listen to, and predefined stamps indicating approval, confidentiality, and the like. You can even add notes that attach files to the PDF document (useful when you want to include alternative text or graphics that should be considered as possible replacements or additions).
To add a hidden comment with the Note tool, follow these steps:

1. Click the Note tool on the Commenting toolbar or type S if the singlekey accelerators feature is turned on in the Acrobat General >Preferences.
2. Click the Note mouse pointer at the place on the page in the PDF document where you want the Note icon to appear. When you click this pointer, Acrobat opens a comment box that shows your name and the current date on the colored (yellow by default) title bar.
3. Type the text of the note in the comment box.
4. If the text of your note is short, you can resize the comment box to better suit the mount of text by positioning the mouse pointer in the sizing box in the lower-right corner and dragging the outline of the box with the arrowhead pointer until it’s the shape and size you want.
5. After you finish typing the text of the note, click the Close button in the upper-left corner of the comment dialog box to close it. You can also double-click the Note icon to close its comment box.

After you click the Close button in the comment box, only the Note icon appears on the page. To open the note’s comment box to read its text, select the Hand tool by pressing H and double-click the Note icon, or right-click the icon (Control+click on the Mac), and then select Open Pop-up Note on its context menu. You can leave a comment box open next to its Note icon on the page by clicking outside of the box rather than clicking its Close button.
You can move notes by dragging their Note icons or their comment boxes (if they’re open) with either the Hand tool or the Note tool. Simply drag the arrowhead pointer to the desired position on the page (usually off the text that you’re commenting on) and then release the mouse button. To move a note back to its original position, right-click (Control+click on the Mac) its Note icon and click Reset Pop-up Note Location on its context menu. To delete a hidden comment, choose Delete on the context menu.