diff --git a/src/Aardvark.Data.Opc/RELEASE_NOTES.md b/src/Aardvark.Data.Opc/RELEASE_NOTES.md
index cbb56b9..572cdc2 100644
--- a/src/Aardvark.Data.Opc/RELEASE_NOTES.md
+++ b/src/Aardvark.Data.Opc/RELEASE_NOTES.md
@@ -1,3 +1,6 @@
+### 0.9.1
+- Fixed PatchHierarchy.loadAndCache for ZIPs
+
 ### 0.9.0
 - Reworked Prinziple
 - Removed AutoOpen attribute from Aara module