diff --git a/src/postProcessing/functionObjects/forces/forceCoeffs/forceCoeffs.H b/src/postProcessing/functionObjects/forces/forceCoeffs/forceCoeffs.H
index a7002663f4..939b0ad84a 100644
--- a/src/postProcessing/functionObjects/forces/forceCoeffs/forceCoeffs.H
+++ b/src/postProcessing/functionObjects/forces/forceCoeffs/forceCoeffs.H
@@ -84,6 +84,7 @@ Description
         magUInf      | free stream velocity magnitude | yes  |
         lRef         | reference length scale for moment calculations | yes |
         Aref         | reference area          | yes |
+        porosity     | flag to include porosity contributions | no | no
     \endtable
 
     Bin data is optional, but if the dictionary is present, the entries must
diff --git a/src/postProcessing/functionObjects/forces/forces/forces.H b/src/postProcessing/functionObjects/forces/forces/forces.H
index 32839b5a0a..0f3654f5b1 100644
--- a/src/postProcessing/functionObjects/forces/forces/forces.H
+++ b/src/postProcessing/functionObjects/forces/forces/forces.H
@@ -79,6 +79,7 @@ Description
         UName        | velocity field name     | no          | U
         rhoName      | density field name (see below) | no   | rho
         CofR         | centre of rotation (see below) | no   |
+        porosity     | flag to include porosity contributions | no | no
         directForceDensity | force density supplied directly (see below)|no|no
         fDName       | name of force density field (see below) | no | fD
     \endtable