diff --git a/modeling-cmds/openapi/api.json b/modeling-cmds/openapi/api.json
index 7674ba62..7e24f231 100644
--- a/modeling-cmds/openapi/api.json
+++ b/modeling-cmds/openapi/api.json
@@ -3615,6 +3615,15 @@
                 "type": "number",
                 "format": "float"
               },
+              "backface_color": {
+                "nullable": true,
+                "description": "Color of the backface",
+                "allOf": [
+                  {
+                    "$ref": "#/components/schemas/Color"
+                  }
+                ]
+              },
               "color": {
                 "description": "Color of the new material",
                 "allOf": [
diff --git a/modeling-cmds/src/def_enum.rs b/modeling-cmds/src/def_enum.rs
index 0c442804..ce04621b 100644
--- a/modeling-cmds/src/def_enum.rs
+++ b/modeling-cmds/src/def_enum.rs
@@ -802,6 +802,9 @@ define_modeling_cmd_enum! {
             pub roughness: f32,
             /// Ambient Occlusion of the new material
             pub ambient_occlusion: f32,
+            /// Color of the backface
+            #[serde(default, skip_serializing_if = "Option::is_none")]
+            pub backface_color: Option<Color>,
         }
         /// What type of entity is this?
         #[derive(Debug, Clone, PartialEq, Serialize, Deserialize, JsonSchema, ModelingCmdVariant)]
diff --git a/modeling-session/examples/cube_png.rs b/modeling-session/examples/cube_png.rs
index 65cffae5..ee77301e 100644
--- a/modeling-session/examples/cube_png.rs
+++ b/modeling-session/examples/cube_png.rs
@@ -21,8 +21,8 @@ const CUBE_WIDTH: LengthUnit = LengthUnit(100.0);
 async fn main() -> Result<()> {
     // Set up the API client.
     let token = env::var("ZOO_API_TOKEN")
-    .or_else(|_| env::var("KITTYCAD_API_TOKEN")) // legacy name
-    .context("You must set $ZOO_API_TOKEN")?;
+        .or_else(|_| env::var("KITTYCAD_API_TOKEN")) // legacy name
+        .context("You must set $ZOO_API_TOKEN")?;
     let client = kittycad::Client::new(token);
 
     // Where should the final PNG be saved?