Apple Aperture 2 - Manual (Page 266)

266 Part II Photo Editing
Applying Keywords Using the Metadata Inspector
When you select an image, you can use the Metadata inspector to see the image’s
keywords and add new keywords, if needed.
To apply keywords using the Metadata inspector:
1 Select an image,
2 Choose Window > Show Inspector (or press I), then click Metadata.
3 Click the Keywords button at the bottom of the Metadata inspector.
A list of the image’s keywords appears.
4 To add a keyword, type a keyword in the Add Keyword field and click the Add (+) button.
Type a keyword here and
click the Add button.