diff --git a/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs b/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs
index 780c2ad491..3d90cc59f4 100644
--- a/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs
+++ b/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs
@@ -222,20 +222,9 @@ namespace osu.Game.Rulesets.Difficulty
         /// <returns>The <see cref="Skill"/>s.</returns>
         protected abstract Skill[] CreateSkills(IBeatmap beatmap, Mod[] mods, double clockRate);
 
-        public class TimedDifficultyAttributes : IComparable<TimedDifficultyAttributes>
-        {
-            public readonly double Time;
-            public readonly DifficultyAttributes Attributes;
-
-            public TimedDifficultyAttributes(double time, DifficultyAttributes attributes)
-            {
-                Time = time;
-                Attributes = attributes;
-            }
-
-            public int CompareTo(TimedDifficultyAttributes other) => Time.CompareTo(other.Time);
-        }
-
+        /// <summary>
+        /// Used to calculate timed difficulty attributes, where only a subset of hitobjects should be visible at any point in time.
+        /// </summary>
         private class ProgressiveCalculationBeatmap : IBeatmap
         {
             private readonly IBeatmap baseBeatmap;
diff --git a/osu.Game/Rulesets/Difficulty/TimedDifficultyAttributes.cs b/osu.Game/Rulesets/Difficulty/TimedDifficultyAttributes.cs
new file mode 100644
index 0000000000..973b2dacb2
--- /dev/null
+++ b/osu.Game/Rulesets/Difficulty/TimedDifficultyAttributes.cs
@@ -0,0 +1,25 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+
+namespace osu.Game.Rulesets.Difficulty
+{
+    /// <summary>
+    /// Wraps a <see cref="DifficultyAttributes"/> object and adds a time value for which the attribute is valid.
+    /// Output by <see cref="DifficultyCalculator.CalculateTimed"/>.
+    /// </summary>
+    public class TimedDifficultyAttributes : IComparable<TimedDifficultyAttributes>
+    {
+        public readonly double Time;
+        public readonly DifficultyAttributes Attributes;
+
+        public TimedDifficultyAttributes(double time, DifficultyAttributes attributes)
+        {
+            Time = time;
+            Attributes = attributes;
+        }
+
+        public int CompareTo(TimedDifficultyAttributes other) => Time.CompareTo(other.Time);
+    }
+}
diff --git a/osu.Game/Screens/Play/HUD/DefaultPerformancePointsCounter.cs b/osu.Game/Screens/Play/HUD/DefaultPerformancePointsCounter.cs
index ff0c628aa6..2bc9f78548 100644
--- a/osu.Game/Screens/Play/HUD/DefaultPerformancePointsCounter.cs
+++ b/osu.Game/Screens/Play/HUD/DefaultPerformancePointsCounter.cs
@@ -40,7 +40,7 @@ namespace osu.Game.Screens.Play.HUD
         [Resolved(CanBeNull = true)]
         private Player player { get; set; }
 
-        private DifficultyCalculator.TimedDifficultyAttributes[] timedAttributes;
+        private TimedDifficultyAttributes[] timedAttributes;
         private Ruleset gameplayRuleset;
 
         public DefaultPerformancePointsCounter()
@@ -73,7 +73,7 @@ namespace osu.Game.Screens.Play.HUD
             if (player == null)
                 return;
 
-            var attribIndex = Array.BinarySearch(timedAttributes, 0, timedAttributes.Length, new DifficultyCalculator.TimedDifficultyAttributes(judgement.HitObject.GetEndTime(), null));
+            var attribIndex = Array.BinarySearch(timedAttributes, 0, timedAttributes.Length, new TimedDifficultyAttributes(judgement.HitObject.GetEndTime(), null));
             if (attribIndex < 0)
                 attribIndex = ~attribIndex - 1;
             attribIndex = Math.Clamp(attribIndex, 0, timedAttributes.Length - 1);