method-make.md

@@ -28,6 +28,6 @@ agar:
 [Tamlinson and Taylor](https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-54/issue-8/081208/Photoelastic-materials-and-methods-for-tissue-biomechanics-applications/10.1117/1.OE.54.8.081208.short)
 other gel:
 
-[this tutorial]()
+[this tutorial](https://git-xen.lmgc.univ-montp2.fr/PhotoElasticity/Main/wikis/molding-gel)
  
  
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