The phrase 'caption about' is correct in written English
You can use it when referring to a caption accompanying a picture or other visual image. For example: The photo of the beach had a caption about the tranquil beauty of the sunset.
Goings On caption about Marc Ribot & los Cubanos Postizos.
A caption about climate change in Science Times yesterday omitted one picture credit and misstated another.
A picture caption about the seven original Mercury astronauts carried an erroneous date.
A picture caption about reggae in The Arts on Thursday reversed the identities of two performers.
Goings On caption about Marc Ribot & los Cubanos Postizos... Black and white photograph of circus performers in 1958.
A picture caption about the show referred incompletely to the design shown, which incorporated eyeballs into a mesh pattern.
From captions about giant erasers to captions about giant pens, sanity was tossed straight out the window.
"I just got fed up with writing picture captions about celebrities' saggy knees, and thought they were hypocritical and unfair," she continued.
With captions about "brothers enjoying a day in the sun" and young men shown diving into blue waters and laughing together, the pictures would not seem out of place on a friend's Facebook page.
Set in contrast to the photographs of windblown prairies and luminous skies and dinner tables arranged for 20, there are captions about reading lessons and vaccinating calves and doing five loads of laundry every day.
My one criticism of May's season was that The Canal Trip – an unbroken two-hour shot of a boat travelling along a canal – kept taking you out of the moment with irritating captions about local history.
