Update tools.md

t18d · Dec 31, 2024 · 811a42f · 811a42f
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@@ -16,7 +16,9 @@ This page collects digital resources not already mentioned in Zeztel’s [biblio
 
 [The Nomenclature of Manuscripts](https://archive.org/details/companiontoclass00halluoft/page/286/mode/1up) (Hall)
 
-[The E. L. Mark system of citation](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1834803/pdf/bmj00308-0078.pdf) (Chernin)
+[The E. L. Mark, aka author–date, system of citation](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1834803/pdf/bmj00308-0078.pdf) (Chernin)
+
+> really the only option when the use of notes is out of the question
 
 ## Typography
 [FAQ – Greek Language & Script](https://www.unicode.org/faq/greek.html#3) (Unicode Consortium)