PythonInterface.md

@@ -42,7 +42,8 @@ domain = dG3DDomain(tag,phys,sp,lnum, fdg, dim, nonLocalVar, nonConstitutiveExtr
 ```
 where
 - *tag*: a positive integer associated to this domain. If only one domain is available, this number can be choose freely as a positive integer. When multiple domains are presents, this number provides different possibility:
-   * If *fdg=False*, and *tag* is the same for all domains, a conventional constitous Galerkin FE is found.
+   * If *fdg=False*, and *tag* is the same for all domains, a conventional constitous Galerkin (CG) FE is found.
+   * If *fdg=False*, and *tag* is different between two domains, CG is used for these domains but an DG interface between these two domains must be provided to guarantee the continuity of the fields accross this interface. This option is useful when considering multiple domains when only decohesion between them is interested.
 - *phys*
 - *sp*