diff --git a/README.md b/README.md
index cb19f2d..3287991 100644
--- a/README.md
+++ b/README.md
@@ -8,13 +8,19 @@ TODO:
 - [ ] build into python module with classes
 - [ ] maybe wrap system call of blender
 - [x] add cupy/cucim support (partly done)
-- [ ] use openvdb for volume import in blender
+- [x] use openvdb for volume import in blender
 
 required packages: xarray, scikit-image, trimesh, numpy
 
 ## How to use
 
-1. Extract series stl-files for desired time series with e.g. 01_extract_surfaces.py
+1. Create data files usable in blender
+
+	1. Extract series stl-files for desired time series with e.g. 01_extract_surfaces.py
+	
+	or
+	
+	1. Convert numpy arrays to openvdb files, e.g. 04_npy_to_openvdb_in_blender.py . OpenVDB is very useful https://www.youtube.com/watch?v=cqLhhjxch2s. You can load the vdb files as Animation in blender and then do everything there without the following steps.
 
 1. Choose appropitate time step to set up scene and everything (e.g. cycles-render) in blender, do a test render, save the blend-file