Are well-written warnings more likely to be heeded?

I claim that "warnings are more likely to be read and taken seriously, if they are well-written, without errors". Is this claim supported by psychological science?

Like, a warning on a video showing risky extreme sports activities, to not try to imitate. If the warning is poorly written in English, is it more likely to be ignored and not taken seriously, and thus less effective? That is my hunch, but is it really supported by science?