diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ pyRCV2 accepts data in the [BLT file format](http://www.dia.govt.nz/diawebsite.N
 * weighted inclusive Gregory STV (e.g. [Scottish STV](https://www.opavote.com/methods/scottish-stv-rules))
 * unweighted inclusive Gregory STV (e.g. [Australian Senate STV](https://www.legislation.gov.au/Details/C2020C00400/Html/Text#_Toc59107700))
 * exclusive Gregory STV (e.g. [PRSA 1977](https://www.prsa.org.au/rule1977.htm) and [ERS97](https://www.electoral-reform.org.uk/latest-news-and-research/publications/how-to-conduct-an-election-by-the-single-transferable-vote-3rd-edition/))
-* [Meek STV](http://www.dia.govt.nz/diawebsite.NSF/Files/meekm/%24file/meekm.pdf)
+* [Meek STV](http://www.dia.govt.nz/diawebsite.NSF/Files/meekm/%24file/meekm.pdf) – with [tree-packed ballots](http://www.votingmatters.org.uk/ISSUE21/I21P1.pdf) for efficient computation
 * [Wright STV](https://www.aph.gov.au/Parliamentary_Business/Committees/House_of_Representatives_Committees?url=em/elect07/subs/sub051.1.pdf)
 
 pyRCV2 is highly customisable, including options for: