diff --git a/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleCollector/ParticleCollector.H b/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleCollector/ParticleCollector.H
index 84db475552..2f6faea6b5 100644
--- a/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleCollector/ParticleCollector.H
+++ b/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleCollector/ParticleCollector.H
@@ -26,9 +26,60 @@ Class
 
 Description
     Function object to collect the parcel mass- and mass flow rate over a
-    set of polygons.  The polygons are defined as lists of points.  If a
-    parcel is 'collected', it is subsequently flagged to be removed from the
-    domain.
+    set of polygons.  The polygons can either be specified by sets of user-
+    supplied points, or in a concentric circles arrangement.  If a
+    parcel is 'collected', it can be flagged to be removed from the
+    domain using the removeCollected entry.
+
+    Example usage:
+    \verbatim
+    particleCollector1
+    {
+        type            particleCollector;
+
+        mode            concentricCircle;
+        origin          (0.05 0.025 0.005);
+        radius          (0.01 0.025 0.05);
+        nSector         10;
+        refDir          (1 0 0);
+        normal          (0 0 1);
+
+        negateParcelsOppositeNormal no;
+        removeCollected no;
+        surfaceFormat   vtk;
+        resetOnWrite    no;
+        log             yes;
+    }
+
+    particleCollector2
+    {
+        type            particleCollector;
+
+        mode            polygon;
+        polygons
+        (
+            (
+                (0 0 0)
+                (1 0 0)
+                (1 1 0)
+                (0 1 0)
+            )
+            (
+                (0 0 1)
+                (1 0 1)
+                (1 1 1)
+                (0 1 1)
+            )
+        );
+        normal          (0 0 1);
+
+        negateParcelsOppositeNormal no;
+        removeCollected no;
+        surfaceFormat   vtk;
+        resetOnWrite    no;
+        log             yes;
+    }
+    \endverbatim
 
 SourceFiles
     ParticleCollector.C