A headnote is a brief summary of a particular point of law that is added to the text of a court decision to aid readers in locating discussion of a legal issue in an opinion. As the term implies, headnotes appear at the beginning of the published opinion.
In 1906, the United States Supreme Court ruled, in United States v. Detroit Timber & Lumber Company, 200 U.S. 321 (1906), that headnotes have no legal standing and therefore do not set precedent.
References
Headnote Wikipedia(Text) CC BY-SA