diff --git a/source/Cosmos.Core/IOGroup/Mouse.cs b/source/Cosmos.Core/IOGroup/Mouse.cs
index 02fc2f270..2b11f587a 100644
--- a/source/Cosmos.Core/IOGroup/Mouse.cs
+++ b/source/Cosmos.Core/IOGroup/Mouse.cs
@@ -5,9 +5,18 @@ using Cosmos.Core;
 
 namespace Cosmos.Core.IOGroup
 {
+    /// <summary>
+    /// Mouse class. See also: <seealso cref="IOGroup"/>.
+    /// </summary>
     public class Mouse : IOGroup
     {
+        /// <summary>
+        /// Data port.
+        /// </summary>
         public readonly IOPort p60 = new IOPort(0x60);
+        /// <summary>
+        /// Indicator port, used to tell if data came from keyboard or mouse.
+        /// </summary>
         public readonly IOPort p64 = new IOPort(0x64);
     }
 }