The phrase "a card explaining" is correct and usable in written English.
It can be used when referring to a card that provides information or clarification about a specific topic or item.
Example: "Please find enclosed a card explaining the features of the new product."
Alternatives: "a note detailing" or "a card describing".
Nothing, except for a card explaining that a triple-A rating means "exceptionally stable and dependable".
Special shopping features: Find-a-product search; every product also comes with a card explaining its history.
Nestled among them is a photograph of the man who donated them, on a card explaining that they belonged to his late brother, a builder, who died of a heart attack.
I am staying in the office of a family whose kids brought home pins emblazoned with the slogan "More Than Gold"; they were attached to a card explaining the pins' color-coding system (you can collect all five!).
In the food section yesterday, for instance, you would have zipped past a card explaining that Mario Batali is craving manicotti "on a cold, rainy, slushy day," and perhaps paused on an article from the magazine Garden & Gun explaining "the wrong way to drink whiskey".
'The only long-term effect is that I have to carry a card explaining why I set off the alarms when I walk through airport security.' This is the latest health scare to hit the rock star famous for his love of flamboyant excess.
A simple card explaining a government aid program leads to more rice for poor villagers in Indonesia.
Olken and Banerjee describe how a simple card explaining a government aid program leads to more rice for poor villagers in Indonesia.
Many couples communicate their charity hopes to their guests, in part to draw attention to the causes and in some cases to answer the question: "Where's my goody bag?" Jung Lee, a New York wedding planner, said several of her clients were replacing party favors with a small card explaining that a contribution had been made on their behalf.
She said the workers from the Transportation Security Administration would not let her retrieve a medical card explaining the implants, a situation she wrote about on her blog.
Next to each board is a "task card" explaining the assignment, and a separate explanation of which state learning standards it meets.
