diff --git a/src/regionModels/surfaceFilmModels/thermoSingleLayer/thermoSingleLayer.C b/src/regionModels/surfaceFilmModels/thermoSingleLayer/thermoSingleLayer.C
index 07a70d651b..e6cee26e03 100644
--- a/src/regionModels/surfaceFilmModels/thermoSingleLayer/thermoSingleLayer.C
+++ b/src/regionModels/surfaceFilmModels/thermoSingleLayer/thermoSingleLayer.C
@@ -236,11 +236,11 @@ void thermoSingleLayer::correctAlpha()
 
         forAll(alpha_, i)
         {
-            if ((alpha_[i] < 0.5) && (delta_[i] > hydrophilicDry))
+            if ((alpha_[i] < 0.5) && (delta_[i] > hydrophilicWet))
             {
                 alpha_[i] = 1.0;
             }
-            else if ((alpha_[i] > 0.5) && (delta_[i] < hydrophilicWet))
+            else if ((alpha_[i] > 0.5) && (delta_[i] < hydrophilicDry))
             {
                 alpha_[i] = 0.0;
             }
diff --git a/src/regionModels/surfaceFilmModels/thermoSingleLayer/thermoSingleLayer.H b/src/regionModels/surfaceFilmModels/thermoSingleLayer/thermoSingleLayer.H
index 696728e7f9..b13c8ac3b0 100644
--- a/src/regionModels/surfaceFilmModels/thermoSingleLayer/thermoSingleLayer.H
+++ b/src/regionModels/surfaceFilmModels/thermoSingleLayer/thermoSingleLayer.H
@@ -132,10 +132,12 @@ protected:
             //- Activation flag
             bool hydrophilic_;
 
-            //- Length scale applied to deltaWet_ for dry faces, typically 0.5
+            //- Length scale applied to deltaWet_ to determine when a wet
+            //  surface becomes dry, typically 0.5
             scalar hydrophilicDryScale_;
 
-            //- Length scale applied to deltaWet_ for wet faces, typically 0.001
+            //- Length scale applied to deltaWet_ to determine when a dry
+            //  surface becomes wet, typically 0.001
             scalar hydrophilicWetScale_;