diff --git a/etc/caseDicts/postProcessing/visualization/surfaces b/etc/caseDicts/postProcessing/visualization/surfaces
index aa51d81a68..508a4d4c8c 100644
--- a/etc/caseDicts/postProcessing/visualization/surfaces
+++ b/etc/caseDicts/postProcessing/visualization/surfaces
@@ -40,7 +40,7 @@ surfaces
         pointAndNormalDict
         {
             basePoint    (0 0 2); // Overrides default basePoint (0 0 0)
-            normalVector $z;      // $y: macro for (0 0 1)
+            normalVector $z;      // $z: macro for (0 0 1)
         }
     }