Update education/index.md

Author: rvhonorato

education/index.md

@@ -89,7 +89,7 @@ We offer various [research projects](/education/research-projects/) to both bach
 * Consult our [**HADDOCK best practice guide**](/software/bpg/) - a must read before starting to use HADDOCK!
 
 * [**HADDOCK restraints generation**](https://www.bonvinlab.org/haddock-restraints/home.html){:target="_blank"}:
-  A guide for the `haddock-restraints` tool allowing to generate various types of distance restraints for use in HADDOCK.
+  A guide for the `haddock-restraints` tool allowing to generate various types of distance restraints for use in HADDOCK, also available via [a graphical user interface](http://wenmr.science.uu.nl/new/haddock-restraints){:target="_blank"}.
 
 * [**Tutorials for HADDOCK version 2.4**](/education/HADDOCK24): Various tutorials from basic protein-protein docking, to the use of cross-linking data, symmetry and homology informations to guide the docking, and advanced modelling of protein-ligand complexes.