diff --git a/Readme.md b/Readme.md
index 05625b7..0b3b448 100644
--- a/Readme.md
+++ b/Readme.md
@@ -57,7 +57,9 @@ Finaly, if we want to have a filter we can now put it into the body and hold it
 
 <img src="https://git.deuxfleurs.fr/distorsion/3D-printed-parametric-respiratory-one-way-valve/media/branch/main/pictures/one_way_valve_sliced.png?raw=true" alt="Image not available" height="400" />
 
-_Coming soon !_
+There is not much to be know abount printing this one-way valve : You can use prety much any material, although PETG is prefered for he membrane as it is flexible and won't fatigue over time.
+
+When chosoing the thicknes of the membrane (_either the rigid membrane as on the picture on the left, or the flexible membrane for the picture on the right_), you can think about the layer height you will be using, and try to slice the membrane with different parameters before printing. 
 
 ## 4 - Parameters
 
@@ -75,4 +77,8 @@ _**snap_fit_clearance** :_ \[_default=0.09mm_\] The clearance between two object
 
 ### 4.b - Geometrical parameters
 
-_Coming soon !_
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+_**owv_membrane_diameter** :_ \[_default=40mm_\] Diameter of the membrane, he bigger the membrane the more airflow there will be and the lower the cracking pressure will be, wih the obvious drawback of having a larger valve.
+
+_**owv_membrane_center_thickness** and **owv_separate_membrane_center_thickness** :_ \[_default=0.53mm and 1mm_\] Thickness at the center of the membrane (_respectively for the membrane insert and for the separate membrane_), the thicker the membrane the higher the cracking pressure, but also the quicker the valve will close when airflow is stopped. The center thickness of the membrane has more impact on the bending force requiered to bend _the whole_ membrane.
+
+_**owv_membrane_side_thickness** and **owv_separate_membrane_side_thickness** _ :_ \[_default=0.3mm and 5mm_\] Thickness at the side of the membrane (_respectively for the membrane insert and for the separate membrane_). The side thickness of the membrane has more impact on the bending force requiered to bend _only the tip_ of the membrane, where most of the airflow actually passes.
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