diff --git a/06-osm-platform-configuration.md b/06-osm-platform-configuration.md
index 2cf85912c99a94416156a4cbbd7587691ef6792b..55d8a7d4d57b360bee886134e5d7ff2b4a0bb17d 100644
--- a/06-osm-platform-configuration.md
+++ b/06-osm-platform-configuration.md
@@ -103,7 +103,7 @@ OSM can handle Physical Network Functions through managing the lifecycle, in par
 Some relevant concepts are:
 
 - PNF: Physical network function. It refers to a HW box that provides a networking function. For example: Routers, firewalls and load balancers.
-- PDU: Physical deployment unit. It refers to the instance of the PNF that will be managed.
+- PDU: Physical deployment unit. It refers to the instance of the PNF in a VIM or VIM_account that will be managed.
 - HNF: Hybrid network function: Network function composed of both physical and virtual elements.
 
 In OSM, there are no fundamental differences between modelling a VNF, a PNF or a Hybrid Network Function (HNF). In those cases where we want to define NS packages consisting of PNF packages or HNF packages, OSM needs to be instructed about the available PDUs.
@@ -138,7 +138,7 @@ Then, using the OSM CLI, the yaml file is used to register the PDU.
 osm pdu-create --descriptor_file PDU_router.yaml
 ```
 
-Finally, the PDU is included in the descriptor as it was any VDU (with the applicable parameters), and Day1/2 configurations can be applied to it. For example, a PDU could be modeled like this:
+Finally, the PDU is included in the descriptor as it was any VDU (with the applicable parameters) by setting `pdu-type`, and Day1/2 configurations can be applied to it. For example, a PDU could be modeled like this:
 
 ```yaml
     vdu:
@@ -153,6 +153,8 @@ Finally, the PDU is included in the descriptor as it was any VDU (with the appli
               ...
 ```
 
+At instantiation time, OSM looks for a free PDU in the target `VIM_account` with the same type declared at `VNFD.vdu.pdu_type` and having al least all the interfaces declared at `VNFD.vdu`, that is, each `VNFD.vdu.interfaces.name` must be present at `PDU.interfaces.name`.
+
 ## Intra-VIM SDN management (for SDN Assist)
 
 TODO: Page in elaboration.