adding some comments.

lib/sass/table-views.scss

@@ -12,7 +12,7 @@
   li {
     position: relative;
     padding: 11px 60px 12px 15px; // Given extra right padding to accomodate badges, chevrons or buttons. Extra 1px bottom padding given for hairline divider.
-    @include hairline(#c8c7cc, 320px, 15px, single);
+    @include hairline(#c8c7cc, 320px, 15px, single); // Single grey border with a width of 320px and 15px offset.
 
 
     // Remove the border from the last table view item
@@ -68,7 +68,7 @@
     color: #999;
     font-weight: $font-weight;
     background-color: #fafafa;
-    @include hairline(#c8c7cc, 320px, 0, double);
+    @include hairline(#c8c7cc, 320px, 0, double);  // Double (top and bottom) grey border with a width of 320px and no offset.
 
     // Rounding first divider on inset lists and remove border on the top
     &:first-child {