Update README.md

README.md

@@ -87,6 +87,8 @@ print(q_embs @ doc_embs.T)
 ```
 
 #### 2.3 Use custom prompt
+In GEM, embedding can be viewed as an additional skill learned by the backbone LLM; the model remains _promptable_.
+
 By default, GEM uses a reasoning prompt. You may explicitly set your own prompt based on your tasks. Here is an example to use GEM for conventional query expansion:
 
 ```python