diff --git a/README.md b/README.md
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--- a/README.md
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@@ -4,4 +4,4 @@
 
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/LaGuer/Jupyt-Nb/master)
 
-[![Colab](https://colab.research.google.com/github/laguer/Jupyt-Nb/blob/master/Julia%20Jupiter-Notebook%20Constants%20in%20Cosmology.ipynb"><img align=\"left\" src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open in Colab\" title=\"Open and Execute in Google Colaboratory)
+<a href=\"https://colab.research.google.com/github/LaGuer/Jupyt-Nb/blob/master/.ipynb\"><img align=\"left\" src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open in Colab\" title=\"Open and Execute in Google Colaboratory\"></a>