diff --git a/src/lib.rs b/src/lib.rs
index ec42a07..5a64d29 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -41,5 +41,6 @@ pub struct Impedance {
 
 #[derive(Serialize, Deserialize, Schema, Debug, PartialEq)]
 pub struct StartImpedance {
-    pub interval_ms: u32,
+    pub update_frequency: u32,
+    pub sinus_frequency: f32,
 }