Update README.md

README.md

@@ -17,6 +17,10 @@ pipeline_tag: text-generation
 
 **For final model checkpoint, please see:** https://huggingface.co/cerebras/Cerebras-GPT-13B
 
+## Usage of muP checkpoints
+
+Note: Transformers does not support muP for all models, so we need a custom model class (BTLM-3B-8k-base). This causes a situation where users must either (1) enable `trust_remote_code=True` when loading the model or (2) acknowledge the warning about code execution upon loading the model.
+
 ## Uses and Limitations
 
 ### Intended Use