diff --git a/modeling-cmds/src/def_enum.rs b/modeling-cmds/src/def_enum.rs
index 64adf73f..26d98390 100644
--- a/modeling-cmds/src/def_enum.rs
+++ b/modeling-cmds/src/def_enum.rs
@@ -403,7 +403,8 @@ define_modeling_cmd_enum! {
             pub cylinder_id: Uuid,
             /// Number of revolutions.
             pub revolutions: f64,
-            /// Start angle (in degrees).
+            /// Start angle.
+            #[serde(default)]
             pub start_angle: Angle,
             /// Is the helix rotation clockwise?
             pub is_clockwise: bool,
@@ -411,6 +412,26 @@ define_modeling_cmd_enum! {
             pub length: LengthUnit,
         }
 
+        /// Create a helix using the specified parameters.
+        #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema, ModelingCmdVariant)]
+        pub struct EntityMakeHelixFromParams {
+            /// Radius of the helix.
+            pub radius: f64,
+            /// Length of the helix.
+            pub length: LengthUnit,
+            /// Number of revolutions.
+            pub revolutions: f64,
+            /// Start angle.
+            #[serde(default)]
+            pub start_angle: Angle,
+            /// Is the helix rotation clockwise?
+            pub is_clockwise: bool,
+            /// Center of the helix at the base of the helix.
+            pub center: Point3d<LengthUnit>,
+            /// Axis of the helix. The helix will be created around and in the direction of this axis.
+            pub axis: Point3d<f64>,
+        }
+
         /// Mirror the input entities over the specified axis. (Currently only supports sketches)
         #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema, ModelingCmdVariant)]
         pub struct EntityMirror {
diff --git a/modeling-cmds/src/ok_response.rs b/modeling-cmds/src/ok_response.rs
index 659f0633..7b9dd787 100644
--- a/modeling-cmds/src/ok_response.rs
+++ b/modeling-cmds/src/ok_response.rs
@@ -89,6 +89,11 @@ define_ok_modeling_cmd_response_enum! {
         pub struct EntityMakeHelix {
         }
 
+        /// The response from the `EntityMakeHelixFromParams` endpoint.
+        #[derive(Debug, Serialize, Deserialize, Clone, JsonSchema, ModelingCmdOutput)]
+        pub struct EntityMakeHelixFromParams {
+        }
+
         /// The response from the `EntityMirror` endpoint.
         #[derive(Debug, Serialize, Deserialize, Clone, JsonSchema, ModelingCmdOutput)]
         pub struct EntityMirror {