Update README.md

README.md

@@ -27,7 +27,7 @@ Please refer to [S-Lab License 1.0](https://github.com/IceClear/StableSR/blob/ma
 
 ### Limitations
 
-- StableSR still requires multiple steps for generating a large image beyond 512 or 768, which is much slower than GAN-based approaches.
+- StableSR still requires multiple steps for generating an image, which is much slower than GAN-based approaches, especially for large images beyond 512 or 768.
 - StableSR sometimes cannot keep 100% fidelity due to its generative nature.
 - StableSR sometimes cannot generate perfect details under complex real-world scenarios.