diff --git a/Modules/DICOMReader/TODOs.txt b/Modules/DICOMReader/TODOs.txt
index 84d7d54046..75539de2da 100644
--- a/Modules/DICOMReader/TODOs.txt
+++ b/Modules/DICOMReader/TODOs.txt
@@ -1,14 +1,18 @@
 
 [ ] Either NRRD cache option or slice-by-slice loading
 [ ] Performance of mitkdump / DICOMReaderSelector (TagCache?)
-[ ] Sorting by "Image Time" seems undeterministic (clarkson test data)
+[?] Sorting by "Image Time" seems undeterministic (clarkson test data)
+    - seems deterministic on Linux, needs test on Windows
 [ ] Fallback to filename instead of instance UID?
 [ ] Implement Configurator::GetBuiltIn3DReaders() (don't ignore "classic reader")
 [ ] Complete MITK properties of images: level/window and color type (MONOCHROME1/2)
 [ ] Multi-Frame images (DCMTK)
 [ ] Check input images fo DICOMness and non-multi-frameness
 [ ] Use CanReadFile() in selection!
 [ ] Check TODO in mitkDICOMTag.cpp
 [ ] Configurable precision for tag value comparisons
-[ ] Images are upside-down in some cases
+[x] Images are upside-down in some cases
+    - error was hidden assumption somewhere: filenames for ImageSeriesReader need
+      to be in an order that goes along the image normals, not in the opposite
+      direction
 [ ] ...