diff --git a/src/lagrangian/intermediate/particleForces/particleForces.H b/src/lagrangian/intermediate/particleForces/particleForces.H
index fbe88a6dc8..f0be486381 100644
--- a/src/lagrangian/intermediate/particleForces/particleForces.H
+++ b/src/lagrangian/intermediate/particleForces/particleForces.H
@@ -26,7 +26,8 @@ Class
     Foam::particleForces
 
 Description
-    Particle forces
+    Provides a mechanism to calculate particle forces
+    Note: forces are force per unit mass (accelerations)
 
 SourceFiles
     particleForces.C