diff --git a/content/zettels/voice_coil_actuators.md b/content/zettels/voice_coil_actuators.md
index 0080fa8..433cd47 100644
--- a/content/zettels/voice_coil_actuators.md
+++ b/content/zettels/voice_coil_actuators.md
@@ -90,14 +90,17 @@ Let's fix `m` (payload mass) and `Df` (wanted motion induced by the voice coil).
 Then, let's vary `f0` and compute the corresponding `Dg`, `Fmax` and `k`.
 
 ```matlab
-g = 9.8;
+%% Fixed Parameters
+g = 9.8; % [m/s^2]
 m = 5; % [kg]
 Df = 5e-3; % [m]
 
+%% Suspension resonance is varied
 f0 = 0.1:0.1:20; % [Hz]
 ```
 
 ```matlab
+%% Other parameters are computed
 k = m * (2*pi*f0).^2; % [N/m]
 Dg = m * g ./ k; % [m]
 Fmax = k * Df; % [N]
@@ -114,14 +117,17 @@ Let's fix `m` (payload mass) and `Fmax` (maximum force applied by the Voice coil
 Then, let's vary `Df` and compute the corresponding `Dg`, `f0` and `k`.
 
 ```matlab
-g = 9.8;
+%% Fixed Parameters
+g = 9.8; % [m/s^2]
 m = 5; % [kg]
 Fmax = 50; % [N]
 
+%% Wanted stroke is varied
 Df = 1e-3:1e-4:10e-3; % [m]
 ```
 
 ```matlab
+%% Other parameters are computed
 k = Fmax./Df; % [N/m]
 f0 = sqrt(k/m)/2/pi; % [Hz]
 Dg = m * g ./ k; % [m]