diff --git a/python/src/format.endf.python.cpp b/python/src/format.endf.python.cpp
index f3ea812..444d654 100644
--- a/python/src/format.endf.python.cpp
+++ b/python/src/format.endf.python.cpp
@@ -29,6 +29,14 @@ namespace format {
           python::overload_cast< njoy::codex::NuclideID, njoy::codex::ReactionID,
                                  const njoy::ENDFtk::section::SquareMatrix& >( &njoy::codex::format::fromENDF ),
           python::arg( "nuclide" ), python::arg( "reaction" ), python::arg( "endf" ),
+          "Return a CovarianceBlock from an ENDF SquareMatrix component" )
+    .def( "from_endf",
+          python::overload_cast< njoy::codex::NuclideID, njoy::codex::ReactionID,
+                                 njoy::codex::NuclideID, njoy::codex::ReactionID,
+                                 const njoy::ENDFtk::section::SquareMatrix& >( &njoy::codex::format::fromENDF ),
+          python::arg( "row_nuclide" ), python::arg( "row_reaction" ),
+          python::arg( "column_nuclide" ), python::arg( "column_reaction" ),
+          python::arg( "endf" ),
           "Return a CovarianceBlock from an ENDF SquareMatrix component" );
   }
 } // namespace format