diff --git a/src/sampling/sampledSurface/sampledPlane/sampledPlane.H b/src/sampling/sampledSurface/sampledPlane/sampledPlane.H
index b5dc66508e..5142c63143 100644
--- a/src/sampling/sampledSurface/sampledPlane/sampledPlane.H
+++ b/src/sampling/sampledSurface/sampledPlane/sampledPlane.H
@@ -27,6 +27,8 @@ Class
 Description
     A sampledSurface defined by a cuttingPlane. Always triangulated.
 
+    Note: does not actually cut until update() called.
+
 SourceFiles
     sampledPlane.C