diff --git a/index.md b/index.md
index b645a9c..28fbfc7 100644
--- a/index.md
+++ b/index.md
@@ -14,5 +14,5 @@ engages in research activities on technologies (data analysis and machine learni
 
 ## Available documentation
 
-<button type="button" class="btn btn-primary" href="/merlin6">Merlin6</button>
-<button type="button" class="btn btn-primary" href="/merlin7">Merlin7</button>
+<button type="button" class="btn btn-primary"><a href="/merlin6/introduction.html" style="color:rgb(255,255,255);" target="_blank"><b>Merlin6</b></a></button>
+<button type="button" class="btn btn-primary"><a href="/merlin7/introduction.html" style="color:rgb(255,255,255);" target="_blank"><b>Merlin7</b></a></button>