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-rw-r--r--docs/xacml/decision-api.rst4
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diff --git a/docs/xacml/decision-api.rst b/docs/xacml/decision-api.rst
index 7d068c1e..8f6a9933 100644
--- a/docs/xacml/decision-api.rst
+++ b/docs/xacml/decision-api.rst
@@ -9,6 +9,10 @@ The Decision API is used by ONAP components that enforce policies and need a dec
specific situation. The Decision API mimics closely the XACML request standard in that it supports a subject, action
and resource.
+When the PAP activates an xacml-pdp, the decision API becomes available. Conversely, when the PAP deactivates an xacml-pdp, the
+decision API is disabled. The decision API is enabled/disabled by the PDP-STATE-CHANGE messages from PAP. If a request is made
+to the decision API while it is deactivated, a "404 - Not Found" error will be returned.
+
.. csv-table::
:header: "Field", "Required", "XACML equivalent", "Description"