diff --git a/install.rst b/install.rst
index 807b87c78..7f6e59676 100644
--- a/install.rst
+++ b/install.rst
@@ -129,7 +129,9 @@ db-pool
 db-extra-search-path
 --------------------
 
-  Extra schemas to add to the `search_path <https://www.postgresql.org/docs/11/ddl-schemas.html#DDL-SCHEMAS-PATH>`_ of every request. These schemas tables, views and stored procedures don't get API endpoints, they can only be referred from the database objects exposed in your :ref:`db-schema`.
+  Extra schemas to add to the `search_path <https://www.postgresql.org/docs/11/ddl-schemas.html#DDL-SCHEMAS-PATH>`_ of every request. These schemas tables, views and stored procedures **don't get API endpoints**, they can only be referred from the database objects inside your :ref:`db-schema`.
+
+  This parameter was meant to make it easier to use **PostgreSQL extensions** (like PostGIS) that are outside of the :ref:`db-schema`.
 
   Multiple schemas can be added in a comma-separated string, e.g. ``public, extensions``.