A more thorough explanation:

Definition: To declare or announce publicly or to proclaim. Especially with regard to laws or regulations, to put into force or effect.

• The government promulgated a new law to protect endangered species.
• The company promulgated a new policy on remote work.

These examples illustrate how promulgate is used to describe the act of making something official and publicly known. In the first example, the government is announcing a new law that will be put into effect. In the second example, the company is declaring a new policy that will be enforced. Both examples show how promulgate is used to describe the act of making something official and publicly known.