diff --git a/src/aeros_simulation/schema.py b/src/aeros_simulation/schema.py
index 0e25d0b..7f14ce6 100644
--- a/src/aeros_simulation/schema.py
+++ b/src/aeros_simulation/schema.py
@@ -71,6 +71,7 @@ class SimulationCalc(BaseModel):
     aeros_node: SimulationNode
     contribution: Optional[float] = 0
     criticality: Optional[float]
+    contribution_factor: Optional[float]
 
 class SimulationPlot(BaseModel):
     id: UUID