The request is a vote of confidence in Henderson, who carried Ko's bag in last year's event when she was a 15-year-old schoolgirl.
Ko won the Open as an amateur to become the first New Zealander to win the home championship.
A year later, a year older and playing for a share of the $300,000 purse as a professional, Ko still rates Henderson's input as a successful caddy.
Since she turned professional, her management group has changed her coach and changed her clubs, leaving Henderson as the sole survivor from the past.
Henderson coaches in Norway during the southern hemisphere winter and has been working for professional Shelley Duncan in the Otago Golf Shop at Balmacewen during the summer.
He will dust off his Clearwater yardage book in preparation for an exciting tournament.
During his professional career, Henderson has caddied for several leading professionals, including Greg Turner and Australian Peter O'Malley.
''I have enjoyed caddying but have always treated it as a busman's holiday,'' Henderson said yesterday.
''At 16, she [Ko] still has a lot of living to do but last year I was in awe of her temperament and emotional control.
''Last year, there were a lot of expectations on New Zealand's best hope and, although a little nervous, she handled the situation brilliantly.
''I was amazed when I checked out her bag last year to find only four golf balls for the final round. Most players I have caddied for have at least a dozen balls but she exhibited a supreme confidence I had not encountered before.''
Ko finished the LPGA season-opening Bahamas Classic in a tie for seventh yesterday.
Ko, who began the day in a tie for eighth, hit five birdies in a 5-under-par 68 in her final round.
American Jessica Korda hit a 66 to win, overtaking previous leader Na Yeon Choi, of South Korea. American Stacy Lewis was second, with Choi in a four-way tie for third.
