What does Numbers 12:1 mean?

Miriam and Aaron started talking against Moses because he had married a woman from Cush. They said, 'Is Moses the only one the Lord speaks through? Doesn’t he also speak through us?' But the Lord heard what they said. Numbers 12:1 - Modern Text Bible

(Miriam and Aaron were jealous of Moses’ special role and used his marriage as an excuse to challenge his authority, but God was paying attention.)