diff --git a/testing/data/ia6cho.tja b/testing/data/ia6cho.tja
index 0c51de1..b16c4dd 100644
--- a/testing/data/ia6cho.tja
+++ b/testing/data/ia6cho.tja
@@ -1,4 +1,6 @@
-BPM:186
+// This song features mid-measure BPMCHANGE commands.
+// It also mixes in SCROLL and MEASURE commands next to the BPMCHANGE commands.
+BPM:186
 OFFSET:-11.430
 
 COURSE:Edit
diff --git a/testing/data/mikdp.tja b/testing/data/mikdp.tja
index 8b18772..1466c08 100644
--- a/testing/data/mikdp.tja
+++ b/testing/data/mikdp.tja
@@ -1,3 +1,5 @@
+// This is a basic song with notes, balloons, and drumrolls.
+// It does not feature BPMCHANGEs, branches, or multiplayer commands.
 BPM:181
 OFFSET:-1.99