bit more comment cleanup

core/src/net/sf/openrocket/rocketcomponent/FinSet.java

@@ -638,17 +638,18 @@ public abstract class FinSet extends ExternalComponent implements RingInstanceab
 	}
 
 	/*
-	 * Return an approximation of the longitudinal unitary inertia of the fin set.
+	 * Return an approximation of the longitudinal unitary moment of inertia
+     *
 	 * The process is the following:
 	 * 
-	 * 1. Approximate the fin with a rectangular fin
+	 * 1. Approximate a fin with a rectangular fin
 	 * 
 	 * 2. The unitary moment of inertia of one fin is taken as the average
 	 *    of the unitary moments of inertia through its center perpendicular
 	 *    to the plane (Izz/M), and through its center parallel to the plane (Iyy/M)
 	 *    
 	 * 3. If there are multiple fins, the inertia is shifted to the center of the
-	 *    Finset.
+	 *    FinSet.
 	 */
 	@Override
 	public double getLongitudinalUnitInertia() {
@@ -679,9 +680,10 @@ public abstract class FinSet extends ExternalComponent implements RingInstanceab
 		if (finCount == 1)
 			return inertia;
 
-		// recheck (yet again) when I get home.  Need to apply parallel axis theorem
-		// to Izz, but not to Iyy.  Since we're looking at average of Iyy and Izz,
-		// weight parallel axis theorem by 1/2.
+		// Move axis to center of FinSet.  We need to apply parallel axis theorem
+		// to Izz, but not to Iyy (as the displacement as we move to the new axis
+		// is along Y).  Since our moment of inertial is the average of Iyy and Izz,
+		// this is accomplished by just weighting the transformation from the theorem by 1/2
 		return inertia + MathUtil.pow2(MathUtil.safeSqrt(h2) / 2 + getBodyRadius()) / 2;
 	}
 	
@@ -695,7 +697,7 @@ public abstract class FinSet extends ExternalComponent implements RingInstanceab
 	 *    about the center of the approximated fin.
 	 *    
 	 * 2. If there are multiple fins, shift the inertia axis to the center
-	 *    of the Finset
+	 *    of the Finset.
 	 */
 	@Override
 	public double getRotationalUnitInertia() {