diff --git a/PathPlanning/basicPathPlanning/drag.m b/PathPlanning/basicPathPlanning/drag.m
index 94036b8..a07afb8 100644
--- a/PathPlanning/basicPathPlanning/drag.m
+++ b/PathPlanning/basicPathPlanning/drag.m
@@ -8,8 +8,8 @@
     mu = .001*ones(length(v),1);
     g = 9.81;
     calpha = 1.06e-2;
-    
+    % Constant definitions: Elevation Change, Air Resistance, Turning, Rolling Resistance
     losses = [g*dh, c/m*v.^2, calpha*(v.*thetadot).^2, mu*g];
     f = sum(losses,2);
     
-end
\ No newline at end of file
+end