Ecto.Query.limit

You're seeing just the macro limit, go back to Ecto.Query module for more information.
Link to this macro

limit(query, binding \\ [], expr)

View Source (macro)

A limit query expression.

Limits the number of rows returned from the result. Can be any expression but has to evaluate to an integer value and it can't include any field.

If limit is given twice, it overrides the previous value.

Keywords example

from(u in User, where: u.id == ^current_user, limit: 1)

Expressions example

User |> where([u], u.id == ^current_user) |> limit(1)