How do I add a table header row in Word?

Why fix?

(From Microsoft Word 2015) A table header row contains column headings that provide context and aid navigation of the data in the table.

For Word 2015 (Windows)

1. Select the table and highlight the top header row(s).
   
2. Click on the Table Tools | Layout tab
3. Click Repeat Header Rows in the Data group to mark the selected rows as header
   

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