diff --git a/osu.Game/Beatmaps/Beatmap.cs b/osu.Game/Beatmaps/Beatmap.cs
index 133a22d8f7..435183fe92 100644
--- a/osu.Game/Beatmaps/Beatmap.cs
+++ b/osu.Game/Beatmaps/Beatmap.cs
@@ -93,6 +93,8 @@ namespace osu.Game.Beatmaps
                                     if (t.Time > lastTime)
                                         return (beatLength: t.BeatLength, 0);
 
+                                    // osu-stable forced the first control point to start at 0.
+                                    // This is reproduced here to maintain compatibility around osu!mania scroll speed and song select display.
                                     double currentTime = i == 0 ? 0 : t.Time;
                                     double nextTime = i == ControlPointInfo.TimingPoints.Count - 1 ? lastTime : ControlPointInfo.TimingPoints[i + 1].Time;