better comments
diff --git a/org.eclipse.nebula.widgets.nattable.core.test/src/org/eclipse/nebula/widgets/nattable/core/layer/AxisTest.xtend b/org.eclipse.nebula.widgets.nattable.core.test/src/org/eclipse/nebula/widgets/nattable/core/layer/AxisTest.xtend
index c306363..76495e5 100644
--- a/org.eclipse.nebula.widgets.nattable.core.test/src/org/eclipse/nebula/widgets/nattable/core/layer/AxisTest.xtend
+++ b/org.eclipse.nebula.widgets.nattable.core.test/src/org/eclipse/nebula/widgets/nattable/core/layer/AxisTest.xtend
@@ -15,13 +15,14 @@
 	}
 	
 	static def testAxis(String axisName, Axis axis, List<? extends Serializable> expectedIds, List<Integer> expectedPixels) {
-		// Axis
-		
+		// Segment count
 		assertEquals('''«axisName» getSegmentCount''', expectedIds.size, axis.segmentCount)
 		
+		// Start pixel of segment position
 		for (segmentPosition : 0 .. axis.segmentCount)
 			assertEquals('''«axisName» getStartPixelOfSegmentPosition(«segmentPosition»)''', expectedPixels.get(segmentPosition), axis.getStartPixelOfSegmentPosition(segmentPosition))
 		
+		// Segment position of pixel location
 		assertEquals('''«axisName» < range getSegmentPositionOfPixelLocation(«expectedPixels.get(0) - 1»)''', -1, axis.getSegmentPositionOfPixelLocation(expectedPixels.get(0) - 1))
 		for (segmentPosition : 0 ..< axis.segmentCount) {
 			val pixelLocation = expectedPixels.get(segmentPosition)
@@ -29,14 +30,15 @@
 		}
 		assertEquals('''«axisName» > range getSegmentPositionOfPixelLocation(«axis.pixelSize»)''', axis.segmentCount, axis.getSegmentPositionOfPixelLocation(axis.pixelSize))
 		
+		// Id of segment position
 		for (segmentPosition : 0 ..< axis.segmentCount)
 			assertEquals('''«axisName» getIdOfSegmentPosition(«segmentPosition»)''', expectedIds.get(segmentPosition), axis.getIdOfSegmentPosition(segmentPosition))
 
+		// Segment position of id
 		for (segmentId : expectedIds)
 			assertEquals('''«axisName» getSegmentPositionOfId(«segmentId»)''', expectedIds.indexOf(segmentId), axis.getSegmentPositionOfId(segmentId))
 		
-		// Axis invariants
-		
+		// Pixel size
 		assertEquals('''«axisName» pixelSize''', expectedPixels.get(expectedPixels.size - 1) - expectedPixels.get(0), axis.pixelSize)
 	}