update custom ckpt instructions

README.md

@@ -65,9 +65,11 @@ The tool provides functionality to load a batch of images (hyperspectral, multis
 
 GSense supports Vit-h, Vit-b SAM backbones and uses the hugging face transformers library. Downloading model checkpoints for default Vit-h and Vit-b weights is not necessary.
 
-To use a model checkpoint obtained from fine-tuning SAM with peanut and sweetcorn [root images](https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/MAYDHT), download the custom checkpoint from below and move it to the 'ckpt' folder.
+To use a model checkpoint obtained from fine-tuning SAM Vit-b model with [peanut and sweetcorn root images](https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/MAYDHT), download the custom checkpoint from below link and move it to the 'ckpt' folder.
 
-[Custom model checkpoint](https://uflorida-my.sharepoint.com/:u:/g/personal/ma_naikodi_ufl_edu/EQPiLVyRX3JJjba-COypQuYBItpvAA23xR4QWx3ZmqxI6A?e=llgAXU)
+Download [Custom model checkpoint](https://uflorida-my.sharepoint.com/:u:/g/personal/ma_naikodi_ufl_edu/EQPiLVyRX3JJjba-COypQuYBItpvAA23xR4QWx3ZmqxI6A?e=llgAXU)
+
+Note: Make sure to choose 'Vit-b' model type from the dropdown field in the Model Settings tab when using the downloaded custom model checkpoint.
 
 ### Running the Application