diff --git a/src/Aardvark.Data.Opc/RELEASE_NOTES.md b/src/Aardvark.Data.Opc/RELEASE_NOTES.md
index 8742184..3066e8f 100644
--- a/src/Aardvark.Data.Opc/RELEASE_NOTES.md
+++ b/src/Aardvark.Data.Opc/RELEASE_NOTES.md
@@ -1,3 +1,6 @@
+### 0.10.0
+- moved QTree to old Aardvark.SceneGraph.Opc namespace to prevent serialization issues.
+
 ### 0.9.2
 - [Prinziple] Added supported for ZIP archives without explicit directory entries
 - [Prinziple] Added setAllowedExtensions and added *.opcz as default extension