The following note is added next to step 6 in the “Using panels and panel menus” section, on page 24 in the printed book.
You can now choose Show Recent Colors in the Swatches panel menu. The illustration in the book was taken with a previous version of Photoshop, so it does not include the new menu item. The Show Recent Colors option is selected by default.
Note added to the beginning of the “Undoing multiple actions” section, on page 26 in the printed book.
Illustrations of the History panel may not match your screen because the Photoshop update changed the way Photoshop lists some tasks.