Why is Zotero adding an a or b after the date?

I'm going back through my dissertation to check my citations, and oftentimes, Zotero is adding an a or b after the year in my citation: ex. 2011a, p. 12. Any idea why?
  • edited April 19, 2020
    This usually indicates that the same author published multiple works in the same year, and the post-fix disambiguates them in the bibliography.
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