Improve performance description
Change-Id: I8301b58503794cc709fe16c23c7c55eeb2b1b872
diff --git a/Readme.md b/Readme.md
index b5dfca6..e03df67 100644
--- a/Readme.md
+++ b/Readme.md
@@ -22,7 +22,11 @@
![Speed comparison of german tokenizers](https://raw.githubusercontent.com/KorAP/Datok/master/misc/benchmarks.svg)
-Speed comparison of different tokenizers and sentence splitters for German.
+Chart showing speed comparison of different tokenizers and sentence splitters
+for German. `Effi` refers to tokenizing and/or sentence splitting of one
+issue of [Effi Briest](https://www.gutenberg.org/cache/epub/5323/pg5323.html).
+Datok is optimized for large batch sizes, while other tools may
+perform better in other scenarios.
For further benchmarks, especially regarding the quality of tokenization,
see Diewald/Kupietz/Lüngen (2022).