diff --git a/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict b/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
index 4d480b9efc..5f1331e124 100644
--- a/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
+++ b/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
@@ -42,7 +42,11 @@ geometry
         //maxTreeDepth 10;    // optional:depth of octree. Decrease only in case
                               // of memory limitations.
 
-        // Per region the patchname. If not provided will be <name>_<region>.
+        // Per region the patchname. If not provided will be <surface>_<region>.
+        // Note: this name cannot be used to identity this region in any
+        //       other part of this dictionary; it is only a name
+        //       for the combination of surface+region (which is only used
+        //       when creating patches)
         regions
         {
             secondSolid
diff --git a/src/thermophysicalModels/solidThermo/solidThermo/solidThermo.H b/src/thermophysicalModels/solidThermo/solidThermo/solidThermo.H
index cdae056126..a2a5731162 100644
--- a/src/thermophysicalModels/solidThermo/solidThermo/solidThermo.H
+++ b/src/thermophysicalModels/solidThermo/solidThermo/solidThermo.H
@@ -139,7 +139,7 @@ public:
             virtual tmp<volScalarField> rho() const;
 
             //- Density for patch [kg/m^3]
-            virtual tmp<scalarField> rho(const label patchi) const = 0;
+            virtual tmp<scalarField> rho(const label patchi) const;
 
             //- Return non-const access to the local density field [kg/m^3]
             virtual volScalarField& rho();