diff --git a/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloud.H b/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloud.H
index 321fba33ad..29e696dc81 100644
--- a/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloud.H
+++ b/src/lagrangian/intermediate/clouds/Templates/KinematicCloud/KinematicCloud.H
@@ -470,8 +470,8 @@ public:
             //- Total rotational kinetic energy in the system
             inline scalar rotationalKineticEnergyOfSystem() const;
 
-            //- Penetration for percentage of the current total mass
-            inline scalar penetration(const scalar& prc) const;
+            //- Penetration for fraction [0-1] of the current total mass
+            inline scalar penetration(const scalar& fraction) const;
 
             //- Mean diameter Dij
             inline scalar Dij(const label i, const label j) const;
diff --git a/src/lagrangian/intermediate/clouds/baseClasses/kinematicCloud/kinematicCloud.H b/src/lagrangian/intermediate/clouds/baseClasses/kinematicCloud/kinematicCloud.H
index 01c80c16e2..d7a0fcf0d0 100644
--- a/src/lagrangian/intermediate/clouds/baseClasses/kinematicCloud/kinematicCloud.H
+++ b/src/lagrangian/intermediate/clouds/baseClasses/kinematicCloud/kinematicCloud.H
@@ -89,7 +89,7 @@ public:
             virtual scalar rotationalKineticEnergyOfSystem() const = 0;
 
             //- Penetration for percentage of the current total mass
-//            virtual scalar penetration(const scalar& prc) const = 0;
+//            virtual scalar penetration(const scalar& fraction) const = 0;
 
             //- Mean diameter Dij
             virtual scalar Dij(const label i, const label j) const = 0;