diff --git a/INSTALL.md b/INSTALL.md
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+The QuAcK software can be downloaded on GitHub as a Git repository
+```
+git clone https://github.com/pfloos/QuAcK.git
+```
+
+Then, one must define the variable `QUACK_ROOT`. For example, 
+```
+export QUACK_ROOT=$HOME/Work/QuAcK
+```
+You must also install [PySCF](https://pyscf.org) (for example using `pip`)
+```
+pip install pyscf
+```
+
+PySCF is used for the computation of one- and two-electron integrals (mainly).
diff --git a/INSTALL.txt b/INSTALL.txt
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-