diff --git a/Solver_interface/doc/Solver_interface/PackageDescription.txt b/Solver_interface/doc/Solver_interface/PackageDescription.txt
index 255cbc8d473..8b3f6b1570d 100644
--- a/Solver_interface/doc/Solver_interface/PackageDescription.txt
+++ b/Solver_interface/doc/Solver_interface/PackageDescription.txt
@@ -25,6 +25,7 @@
 ## Concepts ##
 
 - `DiagonalizeTraits`
+- `NormalEquationSparseLinearAlgebraTraits_d`
 - `SparseLinearAlgebraTraits_d`
 - `SparseLinearAlgebraWithFactorTraits_d`
 - `SvdTraits`