README.md

@@ -77,13 +77,15 @@ To load and plot the data, a basic example script is available in `example.py`.
 For more utilities and examples of analysis, see the dedicated [voxelwise
 tutorials](https://github.com/gallantlab/voxelwise_tutorials).
 
-## How to get help
+#### How to get help
 
 The recommended way to ask questions is in the issue tracker on the GitHub page
 https://github.com/gallantlab/voxelwise_tutorials/issues.
 
 
-## Data files organization
+## Data set content
+
+#### Data file organization
 
 ```text
 features/                    → feature spaces used for voxelwise modeling
@@ -108,7 +110,7 @@ utils/
 example.py                   → Python example to load and plot the data
 ```
 
-## Data format
+#### Data format
 
 All files are hdf5 files, with multiple arrays stored inside.
 The names, shapes, and descriptions of each array are listed below.