-The Decision API is used by ONAP components that enforce policies and need a decision on which policy to enforce for a specific situation. The Decision API mimics closely the XACML request standard in that it supports a subject, action and resource.
+The Decision API is used by ONAP components that enforce policies and need a decision on which policy to enforce for a
+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.