-meshed source \b Face and the \b Mesh (optional, use it if there are several
-different meshes on the same face). It could also be necessary to
-define the orientation of mesh on the face, which is done by
-indicating two <b>Source Vertices</b>, which belong to the same edge of the
-source face, and two <b>Target Vertices</b>, which belong to the same edge of
-the created \b Face.
+meshed source \b Face and the \b Mesh (It can be omitted only when
+projecting a submesh on another one from the same global Mesh).
+It could also be necessary to define the orientation of mesh on the face
+, which is done by indicating two <b>Source Vertices</b>, which belong
+to the same edge of the source face, and two <b>Target Vertices</b>, which
+belong to the same edge of the created \b Face.