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In page Michelada:

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One concerns a Michel Ésper at Club Deportivo Potosino in San Luis Potosí, Mexico. In the 1960s, Ésper began to ask for his beer with lime, salt, ice, and a straw, in a special cup called "chabela", as if it were a beer lemonade (limonada). The members of the club started asking for beer as "Michel's lemonade", with the name shortening over time to Michelada. As time went by, other sauces were added to the original recipe. Today, it contains the same ingredients as a chelada but contains ice and chile powder on the rim.[1][2]