diff --git a/hydrolib/core/dflowfm/mdu/models.py b/hydrolib/core/dflowfm/mdu/models.py
index c0328158c..e0afb2798 100644
--- a/hydrolib/core/dflowfm/mdu/models.py
+++ b/hydrolib/core/dflowfm/mdu/models.py
@@ -1892,7 +1892,7 @@ class Comments(INIBasedModel.Comments):
         )
         kmx: Optional[str] = Field("Number of vertical layers.", alias="kmx")
         layertype: Optional[str] = Field(
-            "Number of vertical layers.", alias="layerType"
+            "1= sigma-layers, 2 = z-layers, 3 = use VertplizFile.", alias="layerType"
         )
         numtopsig: Optional[str] = Field(
             "Number of sigma-layers on top of z-layers.", alias="numTopSig"