diff --git a/doc/Calibration.md b/doc/Calibration.md
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--- a/doc/Calibration.md
+++ b/doc/Calibration.md
@@ -64,10 +64,13 @@ Steps:
 ![temp_tower](https://user-images.githubusercontent.com/103989404/221344534-40e1a629-450c-4ad5-a051-8e240e261a51.jpeg)  
 Temp tower is a straightforward test. The temp tower is a vertical tower with multiple blocks, each printed at a different temperature. Once the print is complete, we can examine each block of the tower and determine the optimal temperature for the filament. The optimal temperature is the one that produces the highest quality print with the least amount of issues, such as stringing, layer adhesion, warping (overhang), and bridging.
 
+# Retraction tower
+![image](./images/retraction_test.gif)  
 ***
 *Credits:*  
-- *Flowrate test is inspired by [SuperSlicer](https://github.com/supermerill/SuperSlicer)*  
-- *PA Line method is inspired by [K-factor Calibration Pattern](https://marlinfw.org/tools/lin_advance/k-factor.html)*     
-- *PA Tower method is inspired by [Klipper](https://www.klipper3d.org/Pressure_Advance.html)*
-- *Temp tower model is remixed from [Smart compact temperature calibration tower](https://www.thingiverse.com/thing:2729076)
+- *The Flowrate test and retraction test is inspired by [SuperSlicer](https://github.com/supermerill/SuperSlicer)*  
+- *The PA Line method is inspired by [K-factor Calibration Pattern](https://marlinfw.org/tools/lin_advance/k-factor.html)*     
+- *The PA Tower method is inspired by [Klipper](https://www.klipper3d.org/Pressure_Advance.html)*
+- *The temp tower model is remixed from [Smart compact temperature calibration tower](https://www.thingiverse.com/thing:2729076)
+- *The max flowrate test was inspired by Stefan(CNC Kitchen), and the model used in the test is a remix of his [Extrusion Test Structure](https://www.printables.com/model/342075-extrusion-test-structure).
 - *chapgpt* ;)
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