RDF.Graph.put_annotations

You're seeing just the function put_annotations, go back to RDF.Graph module for more information.
Link to this function

put_annotations(graph, statements, annotations)

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Specs

put_annotations(t(), input(), RDF.Description.input() | nil) :: t()

Adds RDF-star annotations to the given set of statements overwriting all existing annotations.

The set of statements can be given in any input form (see add/3).

The predicate-objects pairs to be added as annotations can be given as a tuple, a list of tuples or a map.