diff --git a/org/optimal_stiffness.org b/org/optimal_stiffness.org
index c2bcf58..8ab59fb 100644
--- a/org/optimal_stiffness.org
+++ b/org/optimal_stiffness.org
@@ -644,7 +644,7 @@ The solid curves are corresponding to the nano-hexapod without the micro-station
 #+end_src
 
 #+name: fig:opt_stiffness_micro_station_iff
-#+caption: Change of dynamics from actuator $\tau$ to actuator force sensor $\tau_m$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_micro_station_iff.png][png]], [[./figs/opt_stiffness_micro_station_iff.pdf][pdf]])
+#+caption: Change of dynamics from actuator $\tau$ to actuator force sensor $\tau_m$ due to the micro-station compliance ([[./figs/opt_stiffness_micro_station_iff.png][png]], [[./figs/opt_stiffness_micro_station_iff.pdf][pdf]])
 [[file:figs/opt_stiffness_micro_station_iff.png]]
 
 #+begin_src matlab :exports none
@@ -691,7 +691,7 @@ The solid curves are corresponding to the nano-hexapod without the micro-station
 #+end_src
 
 #+name: fig:opt_stiffness_micro_station_dvf
-#+caption: Change of dynamics from actuator force $\tau$ to actuator displacement $d\mathcal{L}$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_micro_station_dvf.png][png]], [[./figs/opt_stiffness_micro_station_dvf.pdf][pdf]])
+#+caption: Change of dynamics from actuator force $\tau$ to actuator displacement $d\mathcal{L}$ due to the micro-station compliance ([[./figs/opt_stiffness_micro_station_dvf.png][png]], [[./figs/opt_stiffness_micro_station_dvf.pdf][pdf]])
 [[file:figs/opt_stiffness_micro_station_dvf.png]]
 
 #+begin_src matlab :exports none
@@ -738,7 +738,7 @@ The solid curves are corresponding to the nano-hexapod without the micro-station
 #+end_src
 
 #+name: fig:opt_stiffness_micro_station_fx_dx
-#+caption: Change of dynamics from force $\mathcal{F}_x$ to displacement $\mathcal{X}_x$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_micro_station_fx_dx.png][png]], [[./figs/opt_stiffness_micro_station_fx_dx.pdf][pdf]])
+#+caption: Change of dynamics from force $\mathcal{F}_x$ to displacement $\mathcal{X}_x$ due to the micro-station compliance ([[./figs/opt_stiffness_micro_station_fx_dx.png][png]], [[./figs/opt_stiffness_micro_station_fx_dx.pdf][pdf]])
 [[file:figs/opt_stiffness_micro_station_fx_dx.png]]
 
 #+begin_src matlab :exports none
@@ -785,7 +785,7 @@ The solid curves are corresponding to the nano-hexapod without the micro-station
 #+end_src
 
 #+name: fig:opt_stiffness_micro_station_fz_dz
-#+caption: Change of dynamics from force $\mathcal{F}_z$ to displacement $\mathcal{X}_z$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_micro_station_fz_dz.png][png]], [[./figs/opt_stiffness_micro_station_fz_dz.pdf][pdf]])
+#+caption: Change of dynamics from force $\mathcal{F}_z$ to displacement $\mathcal{X}_z$ due to the micro-station compliance ([[./figs/opt_stiffness_micro_station_fz_dz.png][png]], [[./figs/opt_stiffness_micro_station_fz_dz.pdf][pdf]])
 [[file:figs/opt_stiffness_micro_station_fz_dz.png]]
 
 ** Conclusion                                                        :ignore: