diff --git a/hydrolib/core/dflowfm/research/models.py b/hydrolib/core/dflowfm/research/models.py
index 7e0f1dd22..61850c6a9 100644
--- a/hydrolib/core/dflowfm/research/models.py
+++ b/hydrolib/core/dflowfm/research/models.py
@@ -458,7 +458,7 @@ class Comments(Numerics.Comments):
         None, alias="vertadvtypmom3onbnd"
     )
     research_noderivedtypes: Optional[int] = Field(None, alias="noderivedtypes")
-    research_jadelvappos: Optional[bool] = Field(None, alias="jadelvapos")
+    research_jadelvappos: Optional[bool] = Field(None, alias="jadelvappos")
     research_jarhoxu: Optional[int] = Field(None, alias="jarhoxu")
 
 
@@ -507,6 +507,10 @@ class Comments(Physics.Comments):
             "Turbulent Schmidt number for tracer(s).",
             alias="schmidtnumbertracer",
         )
+        research_umodlin: Optional[str] = Field(
+            "Linear friction umod, for ifrctyp=4,5,6.",
+            alias="umodlin",
+        )
         research_uniffrictcoef1dgrlay: Optional[str] = Field(
             "Uniform ground layer friction coefficient for ocean models (m/s) (0: no friction).",
             alias="uniffrictcoef1dgrlay",
@@ -539,6 +543,7 @@ class Comments(Physics.Comments):
     research_schmidtnumbertracer: Optional[float] = Field(
         None, alias="schmidtnumbertracer"
     )
+    research_umodlin: Optional[float] = Field(None, alias="umodlin")
     research_uniffrictcoef1dgrlay: Optional[float] = Field(
         None, alias="uniffrictcoef1dgrlay"
     )