The phrase "caption reading" refers to looking at or reading the words that accompany a picture or video. The words provide more information or context about what is shown in the visual content. Full definition
The pre-titles caption read: «And now... a film 25 years in the making... and unmaking», humorously hinting at the troubles Gilliam has endured to get this Cervantes spin off the ground. (scmp.com)
@HereIsGina @ChloeGMoretz @ImAngelaBassett #DennisQuad #GoldenGlobes,» the unfortunate caption read. (contactmusic.com)