Update README.md

README.md

@@ -286,7 +286,11 @@ Warning: When the input glTF model has transformations, the model will be transf
 cases it's better to remove the transformations from the input model. For example tool 'gltf-tansform' - function clearNodeTransform (https://gltf-transform.dev/modules/functions/functions/clearNodeTransform) can be 
 used to clear local transformations.
 
-- Known issue: Getting attributes in Cesium does not work when there are multiple input models
+Known issues GPU Instancing:
+
+- #81: Trees rotation/ z placement wrong 
+
+- Getting attributes in Cesium does not work when there are multiple input models
 https://community.cesium.com/t/upgrade-3d-tileset-with-composite-cmpt-tile-to-1-1-attribute-data-missing/33177/2
 
 ## Developing