Migration-guide-OTBv8.md

@@ -41,7 +41,6 @@ The two main work for this version 8 have been:
 
 A new DEM Handler was also developed, based on what GDAL proposes.
 
-
 ## The new ImageMetadata object
 
 ### Presentation
@@ -303,10 +302,10 @@ classDiagram
   RPCTransformBase <|-- RPCInverseTransform
 ```
 
-The RPC model is stored in the ```otb::ImageMetadata``` object, using the
-key ```MDGeom::RPC```. The classes ```otb::RPCTransformBase```,
-```otb::RPCForwardTransform``` and ```otb::RPCInverseTransform``` are used to
-perform forward and inverse transformation using this model.
+The RPC model is stored in the ```otb::ImageMetadata``` object, using
+the key ```MDGeom::RPC```. The classes otb::RPCForwardTransform and
+otb::RPCInverseTransform inherit from otb::RPCTransformBase and are
+used to perform forward and inverse transformation using this model.
 
 The abstract class ```otb::RPCTransformBase``` contains the implementation
 of the ```SetMetadataModel``` method, which receives the RPC