diff --git a/src/waves/waveSuperpositions/waveAtmBoundaryLayerSuperposition/waveAtmBoundaryLayerSuperposition.H b/src/waves/waveSuperpositions/waveAtmBoundaryLayerSuperposition/waveAtmBoundaryLayerSuperposition.H
index 47d68047ba..f66e3da08f 100644
--- a/src/waves/waveSuperpositions/waveAtmBoundaryLayerSuperposition/waveAtmBoundaryLayerSuperposition.H
+++ b/src/waves/waveSuperpositions/waveAtmBoundaryLayerSuperposition/waveAtmBoundaryLayerSuperposition.H
@@ -50,7 +50,7 @@ Usage
     type        waveAtmBoundaryLayer;
     // parameters for waveSuperposition ...
     UGasRef     (10 0 0);
-    hRed        10;
+    hRef        10;
     hWaveMin    -2;
     hWaveMax    3;
     \endverbatim