diff --git a/modeling-cmds/openapi/api.json b/modeling-cmds/openapi/api.json
index ac1a173c..ffe9d574 100644
--- a/modeling-cmds/openapi/api.json
+++ b/modeling-cmds/openapi/api.json
@@ -1576,6 +1576,27 @@
               "type"
             ]
           },
+          {
+            "description": "A uuid referencing a helix.",
+            "type": "object",
+            "properties": {
+              "helix_id": {
+                "description": "Id of the helix object.",
+                "type": "string",
+                "format": "uuid"
+              },
+              "type": {
+                "type": "string",
+                "enum": [
+                  "helix"
+                ]
+              }
+            },
+            "required": [
+              "helix_id",
+              "type"
+            ]
+          },
           {
             "description": "A uuid referencing an edge on a solid2d (profile) - used for raw sketch/profile edges. This is distinct from the face-based Edge reference which is used for BRep/swept body edges.",
             "type": "object",
diff --git a/modeling-cmds/src/shared.rs b/modeling-cmds/src/shared.rs
index 9a6c6cf4..6a9fd825 100644
--- a/modeling-cmds/src/shared.rs
+++ b/modeling-cmds/src/shared.rs
@@ -127,6 +127,11 @@ pub enum EntityReference {
         #[serde(default, skip_serializing_if = "Option::is_none")]
         topology_fallback: Option<PrimitiveTopologyFallback>,
     },
+    /// A uuid referencing a helix.
+    Helix {
+        /// Id of the helix object.
+        helix_id: Uuid,
+    },
     /// A uuid referencing an edge on a solid2d (profile) - used for raw sketch/profile edges.
     /// This is distinct from the face-based Edge reference which is used for BRep/swept body edges.
     Solid2dEdge {