Update README.md (#1)

- Update README.md (9bd55b7a6a26d52b7b197c8e9e46e01dfcf19e34)

README.md

@@ -115,7 +115,7 @@ Note that the final model is trained on all data, so we expect performance to in
 ### _Limitations_
 
 The evaluation results described above may not be representative of real-world performance of the model for several reasons. 
-Firstly, the model was only trained and evaluated on photos of snippets with relatively plain backgrounds and relatively good lightning conditions. 
+Firstly, the model was only trained and evaluated on photos of snippets with relatively plain backgrounds and relatively good lighting conditions. 
 This may or may not be feasible in practice. 
 We expect the model to perform better when photos are of better quality, when there are a large number of snippets with distinctive characteristics in the photo, and when there is a lot of text on the snippets (that is entered correctly). 
 The fewer of these requirements are met, the lower we expect the performance of the algorithm to be.