diff --git a/README.md b/README.md
index 0093df5..e216cc0 100644
--- a/README.md
+++ b/README.md
@@ -12,4 +12,8 @@ Most importantly
 
 ```bash
 cargo build --lib --release
-```
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+```
+
+## Notes
+
+It _could_ be that the code in commit `f9b066a166fb0d2f042c6f745fa0ffbcce100666` is actually faster than the current master. While this is certainly not the case in a `debug` build (HEAD is way faster!), a `release` build seems to bring it up to higher speeds... confusing :-)
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