The phrase that describes supporting details is "the facts about a topic." Supporting details are pieces of information or evidence that explain, justify, or provide evidence for the main idea or topic of a text. They support and further develop the main idea by providing specific examples, explanations, facts, or statistics. To identify supporting details in a text, you should look for information that expands upon or provides evidence for the main idea or central theme.
The phrase that describes supporting details is "the facts about a topic."