BaseImageLocation doc update

SpriteLibrary/Sprite.cs

@@ -206,7 +206,9 @@ namespace SpriteLibrary
         /// </summary>
         public bool HasBeenDrawn { get { return _HasBeenDrawn; } private set { _HasBeenDrawn = value; } }
         /// <summary>
-        /// The sprite location as found on the base image.  This is usually the easiest location to use.
+        /// The sprite location as found on the base image.  This is usually the easiest location to use.  Use this to 
+        /// figure out where the sprite is, but use the <see cref="Sprite.PutBaseImageLocation(Point)"/> function to
+        /// move it to another location.
         /// </summary>
         public Point BaseImageLocation { get { return new Point(xPositionOnImage, yPositionOnImage); } }
         /// <summary>