diff --git a/source/Cosmos.Core/IOGroup/PS2Controller.cs b/source/Cosmos.Core/IOGroup/PS2Controller.cs
index f1a20af97..5007f4e3a 100644
--- a/source/Cosmos.Core/IOGroup/PS2Controller.cs
+++ b/source/Cosmos.Core/IOGroup/PS2Controller.cs
@@ -1,9 +1,21 @@
 namespace Cosmos.Core.IOGroup
 {
+    /// <summary>
+    /// PS2 Controller.
+    /// </summary>
     public class PS2Controller
     {
+        /// <summary>
+        /// Data IO port.
+        /// </summary>
         public readonly IOPort Data = new IOPort(0x60);
+        /// <summary>
+        /// Status IO port.
+        /// </summary>
         public readonly IOPortRead Status = new IOPortRead(0x64);
+        /// <summary>
+        /// Command IO port.
+        /// </summary>
         public readonly IOPortWrite Command = new IOPortWrite(0x64);
     }
 }