Update README.md

README.md

@@ -2,7 +2,7 @@
 
 The leaderboard repo tracks solutions to [invrs-gym](https://github.com/invrs-io/gym) challenges.
 
-Solutions are the `params` which are passed to the `response` method of the component associated wit an gym challenge. They can be saved to json format by,
+Solutions are the `params` which are passed to the `response` method of the component associated with a gym challenge. They can be saved to json format by,
 
 ```python
 from totypes import json_utils
@@ -12,6 +12,8 @@ with open("my_solution.json", "w") as f:
   f.write(serialized)
 ```
 
+The evaluation metrics include the `eval_metric` scalar associated with each challenge, and the minimum width and spacing measured using the [imageruler](https://github.com/NanoComp/imageruler) algorithm.
+
 ## How to contribute your solutions
 
 - Clone this repository