Say that it uses SM2 Anki

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diff --git a/README.md b/README.md
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 nix develop --command bin/watch.sh
 ```
 
+# Space repetition algorithm
+
+The SM2 algorithm used by Anki has been implemented for space repetition. See
+[src/space_repetition.rs](src/space_repetition.rs).
+
 # Deck
 
 Cards are created from a plain text `./deck` file: