Update README.md

README.md

@@ -76,7 +76,7 @@ If you choose to use `llama-cli`, pay attention to the removal of `-cml` for the
   -ngl 28 -fa
 ```
 
-Evaluation
+## Evaluation
 
 We implement perplexity evaluation using wikitext following the practice of `llama.cpp` with `./llama-perplexity` (the previous `./perplexity`). 
 In the following we report the PPL of GGUF models of different sizes and different quantization levels.