flesh out descriptions

README.md

@@ -27,8 +27,8 @@ The `Librarian Bots` organization is an effort by Hugging Face's [Machine Learni
  
 ## 💽 Datasets 
 
-- [Model Cards with first commit information](https://huggingface.co/datasets/librarian-bots/card_with_first_commit): a dataset containing model cards for models hosted on the Hugging Face hub with first commit information for each model.
+- [Model Cards with first commit information](https://huggingface.co/datasets/librarian-bots/card_with_first_commit): a dataset containing model cards for models hosted on the Hugging Face hub with first commit information for each model. Model cards are intended to help communicate the strength and weaknesses of machine learning models. Whilst these model cards are primarily intended to be read by a human they are themselves also interesting corpus that can be used to explore models hosted on the Hub in various different ways.
 
 ## 🤖 Models 
 
-- [BERTopic model card bias topic model](https://huggingface.co/librarian-bots/BERTopic_model_card_bias): a BERTopic model trained on model card bias sections.
+- [BERTopic model card bias topic model](https://huggingface.co/librarian-bots/BERTopic_model_card_bias): a BERTopic model trained on the bias section of model cards hosted on the Hub. The goal of this model is to explore which topics are discussed in the bias section of model cards. Potentially in the future models such as this could also be used to detect 'drift' in the kinds of bias being discussed in model cards hosted on the Hub.