  Based on historical facts, revisited from a present-day perspective, and on
the documented opinions of the scientists involved in the discovery themselves,
strong arguments are given in favor of a proposal to include prominent
astronomer Vesto Slipher to the suggested addition of Georges Lema\^itre's name
to Hubble's law on the expansion of the Universe, and thus eventually call it
Hubble-Lema\^itre-Slipher's (HLS) law.
