diff --git a/doc/source/datanet/openstack/data-networks-overview.rst b/doc/source/datanet/openstack/data-networks-overview.rst
index e6f0c8c88..a13c8d534 100644
--- a/doc/source/datanet/openstack/data-networks-overview.rst
+++ b/doc/source/datanet/openstack/data-networks-overview.rst
@@ -31,6 +31,13 @@ data networks are supported by the |prod-os| virtual switch. For details on
 creating data networks, assigning them to node interfaces, and displaying
 data networks, see the following |prod| documentation:
 
+.. important::
+
+    When adding or assigning Data Networks while |prod-os| has already
+    been applied, it is necessary to re-apply the application. The
+    |prod-os| / Platform integration does not automatically detect newly
+    created data networks, which could lead to connectivity issues.
+
 .. _data-networks-overview-ul-yj1-dtq-3nb:
 
 -   |adding-data-networks-using-the-cli|