diff --git a/intrastat_product/README.rst b/intrastat_product/README.rst
index 28a2020..99de851 100644
--- a/intrastat_product/README.rst
+++ b/intrastat_product/README.rst
@@ -102,6 +102,12 @@ and adapt the code for the specific needs of your country.
 
   Cf. l10n_be_istrastat_product as example, replace "be" by your Country Code.
 
+**Other functionality added by this module:**
+
+* Compute the Intrastat Lines in an invoice.
+  For this, your user needs to be in the "Technical / Invoice Intrastat Transaction Details" group.
+  Go to the "Intrastat transaction details" tab and press **Compute**
+
 Known issues / Roadmap
 ======================
 
diff --git a/intrastat_product/static/description/index.html b/intrastat_product/static/description/index.html
index 58bd746..793da6e 100644
--- a/intrastat_product/static/description/index.html
+++ b/intrastat_product/static/description/index.html
@@ -444,6 +444,12 @@ the customization or new method is required for multiple countries).</p>
 <p>Cf. l10n_be_istrastat_product as example, replace “be” by your Country Code.</p>
 </li>
 </ul>
+<p><strong>Other functionality added by this module:</strong></p>
+<ul class="simple">
+<li>Compute the Intrastat Lines in an invoice.
+For this, your user needs to be in the “Technical / Invoice Intrastat Transaction Details” group.
+Go to the “Intrastat transaction details” tab and press <strong>Compute</strong></li>
+</ul>
 </div>
 <div class="section" id="known-issues-roadmap">
 <h1><a class="toc-backref" href="#id4">Known issues / Roadmap</a></h1>