diff --git a/docs/source/alfacase/api_reference.rst b/docs/source/alfacase/api_reference.rst
index d8f2074e..a602b36c 100644
--- a/docs/source/alfacase/api_reference.rst
+++ b/docs/source/alfacase/api_reference.rst
@@ -63,6 +63,8 @@ PVTs
 
 .. autoclass:: alfasim_sdk.PvtModelPhTableParametersDescription()
 
+.. autoclass:: alfasim_sdk.PvtModelConstantPropertiesDescription()
+
 
 PVT Combined
 -----------------