Update README.md

README.md

@@ -103,4 +103,4 @@ print(scores)
 
 # Limitations
 
-Currently, please ensure that dpi of input images be a high value like `300` dpi, a lower dpi like `100` may cause the model performance degrade. We will augment data and fix this in our latest version.
+Currently, please ensure that image sizes within the same knowledge base be similar. High variance of image size may cause the model performance degrade. We will augment data and fix this issue in our future version.