little help for INTEGRAL variant
@@ -189,6 +189,20 @@ that can be queried.
The returned table includes both the names and a short description of each
mission table.
+Using alternative HEASARC servers
+-------------------------------
+
+It is possible to set alternative locations for HEASARC server. One such location
+is hosted by `INTEGRAL Science Data Center <https://www.isdc.unige.ch/>`_, and has further,
+more recent, tables relevant for INTEGRAL spacecraft.
+
+.. code-block:: python
+
+ import astroquery
+ astroquery.heasarc.Conf.server.set('https://www.isdc.unige.ch/browse/w3query.pl')
+
+
+
Downloading identified datasets
-------------------------------
