Add clarifying comment to Part4View in Layout

Layout/app/src/main/java/cse340/layout/Part4View.java

@@ -21,7 +21,8 @@ public class Part4View extends ScrollView {
      * <p>
      * Note: Do not track the height of the Drawables in each column, but the height of the
      * ImageView on the screen. This is done as high-resolution images should not affect the
-     * ordering more than lower ones.
+     * ordering more than lower ones. An alternative is to track the H:W aspect ratio as this will
+     * be invariant with regard to photo resolution.
      * <p>
      * Each image should be vMargin from the previous image vertically (or parent if first image).
      * There should be a vMargin gap between the two columns, however, the center of the gap must be
@@ -37,4 +38,4 @@ public class Part4View extends ScrollView {
     public Part4View(Context context, List<String> imageNames, int vMargin) {
         super(context);
     }
-}
\ No newline at end of file
+}