diff --git a/README.md b/README.md
index a809751..af42c5f 100644
--- a/README.md
+++ b/README.md
@@ -52,4 +52,8 @@ make the slide fade in (`!` makes the slide suddenly appear in standard simai).
 
 #### SXT caveats
 - Encrypted chart files (`.srb`/`.szb`/`.scb`/`.sdb`) are not supported. Decrypt 
-them before loading into the game.
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+them before loading into the game.
+- Since this chart format does not contain timing data, the song's BPM is retrieved
+by loading the `Music.xml` associated with the chart, **and it is assumed that the
+chart and `Music.xml` is in the same folder**. The SXT loader will not work if the
+chart file is somehow in a different folder from `Music.xml`.
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