diff --git a/source/Cosmos.Core/IOGroup/VGA.cs b/source/Cosmos.Core/IOGroup/VGA.cs
index 4298e590f..26973e139 100644
--- a/source/Cosmos.Core/IOGroup/VGA.cs
+++ b/source/Cosmos.Core/IOGroup/VGA.cs
@@ -5,21 +5,66 @@ using Cosmos.Core;
 
 namespace Cosmos.Core.IOGroup
 {
+    /// <summary>
+    /// VGA class. See also: <seealso cref="IOGroup"/>.
+    /// </summary>
     public class VGA: IOGroup
     {
+        /// <summary>
+        /// Attribute controller index port.
+        /// </summary>
         public readonly IOPortWrite AttributeController_Index = new IOPortWrite(0x3C0);
+        /// <summary>
+        /// Attribute controller write port.
+        /// </summary>
         public readonly IOPortWrite AttributeController_Write = new IOPortWrite(0x3C0);
+        /// <summary>
+        /// Attribute controller read port.
+        /// </summary>
         public readonly IOPortRead AttributeController_Read = new IOPortRead(0x3C1);
+        /// <summary>
+        /// Miscellaneous output write port.
+        /// </summary>
         public readonly IOPortWrite MiscellaneousOutput_Write = new IOPortWrite(0x3C2);
+        /// <summary>
+        /// Sequencer index port.
+        /// </summary>
         public readonly IOPortWrite Sequencer_Index = new IOPortWrite(0x3C4);
+        /// <summary>
+        /// Sequencer data port.
+        /// </summary>
         public readonly IOPort Sequencer_Data = new IOPort(0x3C5);
+        /// <summary>
+        /// DAC index read port.
+        /// </summary>
         public readonly IOPortWrite DACIndex_Read = new IOPortWrite(0x3C7);
+        /// <summary>
+        /// DAC index write port.
+        /// </summary>
         public readonly IOPortWrite DACIndex_Write = new IOPortWrite(0x3C8);
+        /// <summary>
+        /// DAC data port.
+        /// </summary>
         public readonly IOPort DAC_Data = new IOPort(0x3C9);
+        /// <summary>
+        /// Graphics controller index port.
+        /// </summary>
         public readonly IOPortWrite GraphicsController_Index = new IOPortWrite(0x3CE);
+        /// <summary>
+        /// Graphics controller data port.
+        /// </summary>
         public readonly IOPort GraphicsController_Data = new IOPort(0x3CF);
+        /// <summary>
+        /// CRT controller index port.
+        /// </summary>
         public readonly IOPortWrite CRTController_Index = new IOPortWrite(0x3D4);
+        /// <summary>
+        /// CRT controller data port.
+        /// </summary>
         public readonly IOPort CRTController_Data = new IOPort(0x3D5);
+        /// <summary>
+        /// Instant read port.
+        /// </summary>
         public readonly IOPortRead Instat_Read = new IOPortRead(0x3DA);
 
         /// <summary>