Update README.md

README.md

@@ -18,6 +18,9 @@ The dataset includes three versions of data and annotations for downstream task
 
 ### HSI/
 Hyperspectral images (`.npy` format)
+Each hyperspectral image has size 256×256 pixels with 182 spectral bands.
+
+Additionally, wavelength information for the hyperspectral bands is provided in the file *hsi/wavelengths_realhyper.npy.npy*, supporting spectral analysis across the dataset.
 
 ### MARKUP/
 Field delineation annotations (`.json` format)