diff --git a/BDV N5 format.md b/BDV N5 format.md
index 0ec7a7eb2dd62613bac41c56ab35e313a4d7f190..fa699d936d4e06a0afdefb978a8d38a97c4c8f7a 100644
--- a/BDV N5 format.md	
+++ b/BDV N5 format.md	
@@ -25,8 +25,8 @@ multi-resolution 3D stacks are organized in the following N5 hierarchy:
 ```
 
 Each 3D stack is stored as a dataset with path formatted as `/setup%d/timepoint%d/s%d`.
-Here, `setup` number is flattened index of channel, angle, tile, illumination, etc.,
-`timepoint` is the index of the time point, and `s` is the scale level of the multi-resolution pyramid.
+Here, `setup` number is flattened integer ID of channel, angle, tile, illumination, etc.,
+`timepoint` is the integer ID of the time point, and `s` is the scale level of the multi-resolution pyramid.
 
 ## setup attributes
 Each `setup` group has attributes