Updated documentation again

src/DuetAPI/ObjectModel/Fans/FanThermostaticControl.cs

@@ -10,6 +10,9 @@ public sealed class FanThermostaticControl : ModelObject
         /// <summary>
         /// List of heaters to monitor (indices)
         /// </summary>
+        /// <remarks>
+        /// This is a bitmap represented as an array
+        /// </remarks>
         [Obsolete("Use Sensors instead")]
         public ModelCollection<int> Heaters { get; } = new ModelCollection<int>();
 
@@ -36,6 +39,9 @@ public float? LowTemperature
         /// <summary>
         /// List of sensors to monitor (indices)
         /// </summary>
+        /// <remarks>
+        /// This is a bitmap represented as an array
+        /// </remarks>
         public ModelCollection<int> Sensors { get; } = new ModelCollection<int>();
     }
 }

src/DuetAPI/ObjectModel/Tools/Tool.cs

@@ -12,15 +12,15 @@ public sealed class Tool : ModelObject
 
         /// <summary>
         /// Associated axes. At present only X and Y can be mapped per tool.
-        /// Note that each int[] array is actually a bitmap!
         /// </summary>
         /// <remarks>
         /// The order is the same as the visual axes, so by default the layout is
         /// [
         ///   [0],        // X
         ///   [1]         // Y
         /// ]
-        /// Make sure to set each item individually so the change events are called
+        /// Make sure to set each item individually so the change events are called.
+        /// Each item is a bitmap represented as an array
         /// </remarks>
         public ModelCollection<int[]> Axes { get; } = new ModelCollection<int[]>();
 
@@ -32,6 +32,9 @@ public sealed class Tool : ModelObject
         /// <summary>
         /// List of associated fans (indices)
         /// </summary>
+        /// <remarks>
+        /// This is a bitmap represented as an array
+        /// </remarks>
         public ModelCollection<int> Fans { get; } = new ModelCollection<int>();
 
         /// <summary>