diff --git a/runtime-building-models/README.md b/runtime-building-models/README.md
new file mode 100644
index 0000000..f4048c1
--- /dev/null
+++ b/runtime-building-models/README.md
@@ -0,0 +1,3 @@
+# Runtime building models
+
+An ARCore and Sceneform project that build basic models, like sphere and cube, at runtime and place these into the scene.
diff --git a/runtime-building-models/app/src/main/java/it/norangeb/runtimebuildingmodels/Util.kt b/runtime-building-models/app/src/main/java/it/norangeb/runtimebuildingmodels/Util.kt
index db1c1ca..4e60fe1 100644
--- a/runtime-building-models/app/src/main/java/it/norangeb/runtimebuildingmodels/Util.kt
+++ b/runtime-building-models/app/src/main/java/it/norangeb/runtimebuildingmodels/Util.kt
@@ -88,7 +88,7 @@ fun changeColorOfMaterial(
     color: Color,
     renderable: Renderable
 ) {
-    val newColor = buildMaterial(context, color) {
+    buildMaterial(context, color) {
         renderable.material = it
     }
 }