diff --git a/ProcessLib/TH2M/ConstitutiveRelations/SolidThermalExpansion.h b/ProcessLib/TH2M/ConstitutiveRelations/SolidThermalExpansion.h
index 3eeab68c3d20889880593388ee6e16a36570aa69..6d4a69a73d1b2d8cfbb5000682858a70cb387d32 100644
--- a/ProcessLib/TH2M/ConstitutiveRelations/SolidThermalExpansion.h
+++ b/ProcessLib/TH2M/ConstitutiveRelations/SolidThermalExpansion.h
@@ -19,8 +19,8 @@ template <int DisplacementDim>
 struct SolidThermalExpansionData
 {
     KelvinVector<DisplacementDim> solid_linear_thermal_expansivity_vector;
-    double beta_T_SR = nan;  /// Isotropic solid phase volumetric thermal
-                             /// expansion coefficient.
+    double beta_T_SR = nan;  /// Solid phase volumetric thermal expansion
+                             /// coefficient.
     double thermal_volume_strain = nan;
 };