diff --git a/README.md b/README.md
index a0d9f4e4..22663f81 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ All data is stored in the [/data](data) folder as [CSV](https://en.wikipedia.org
 | closed         | Date on which the channel closed (`YYYY-MM-DD`)                                                                                                                                                                  | Optional | `2020-05-31`                   |
 | replaced_by    | The ID of the channel that this channel was replaced by.                                                                                                                                                         | Optional | `CCTV1.cn`                     |
 | website        | Official website URL.                                                                                                                                                                                            | Optional | `http://www.ahtv.cn/`          |
-| logo           | Logo URL. Only URL with HTTPS protocol are allowed. Supported image types: `PNG`, `JPEG`.                                                                                                                        | Optional | `https://example.com/logo.png` |
+| logo           | Logo URL. Only URL with HTTPS protocol are allowed. Supported image types: `PNG`, `JPEG`.                                                                                                                        | Required | `https://example.com/logo.png` |
 
 ### categories