diff --git a/src/thermophysicalModels/specie/specie/specie.H b/src/thermophysicalModels/specie/specie/specie.H
index 38f36e34f2c6af4e8eb894e8f98a3807916ad04e..10238c220cd617dc51d0b4a365fdd8ec5ae451dc 100644
--- a/src/thermophysicalModels/specie/specie/specie.H
+++ b/src/thermophysicalModels/specie/specie/specie.H
@@ -62,7 +62,7 @@ class specie
         //- Number of moles of this component in the mixture
         scalar nMoles_;
 
-        //- Molecular weight of specie
+        //- Molecular weight of specie [kg/kmol]
         scalar molWeight_;
 
 
diff --git a/src/thermophysicalModels/specie/thermo/polynomial/polynomialThermo.H b/src/thermophysicalModels/specie/thermo/polynomial/polynomialThermo.H
index 4f5481851101dcc8184903841ef502d4393e8462..db53fa8cf52ddae859a9397fab7910e9d9e75532 100644
--- a/src/thermophysicalModels/specie/thermo/polynomial/polynomialThermo.H
+++ b/src/thermophysicalModels/specie/thermo/polynomial/polynomialThermo.H
@@ -98,10 +98,10 @@ class polynomialThermo
 {
     // Private data
 
-        //- Heat of formation [m2/s2]
+        //- Heat of formation [J/kg]
         scalar Hf_;
 
-        //- Standard entropy [m2/(s2 K)]
+        //- Standard entropy [J/(kg.K)]
         scalar Sf_;
 
         //- Specific heat at constant pressure