How does a reader know when a text has been changed from its original text?

A reader can identify changes in a text by comparing it to a verified original version, looking for discrepancies in Wording, structure, or meaning. Notable alterations may include differences in key phrases, missing sections, or added content. Additionally, annotations or footnotes in the edited version may indicate changes, and inconsistencies in tone or style can also signal modifications. Familiarity with the original text can help readers quickly spot these differences.