Update README.md

README.md

@@ -41,6 +41,8 @@ There are a number of environment variables available to configure Suwayomi:
 | **WEB_UI_CHANNEL** | `"stable"` | "bundled" (the version bundled with the server release), "stable" or "preview" - the webUI version that should be used |
 | **WEB_UI_UPDATE_INTERVAL** | `23` | Time in hours - 0 to disable auto update - range: 1 <= n < 24 - how often the server should check for webUI updates |
 | **AUTO_DOWNLOAD_CHAPTERS** | `false` | If new chapters that have been retrieved should get automatically downloaded |
+| **AUTO_DOWNLOAD_EXCLUDE_UNREAD** | `true` | Ignore automatic chapter downloads of entries with unread chapters
+| **AUTO_DOWNLOAD_AHEAD_LIMIT** | `5` | 0 to disable - how many unread downloaded chapters should be available - if the limit is reached, new chapters won't be downloaded automatically
 | **MAX_SOURCES_IN_PARALLEL** | `6` | Range: 1 <= n <= 20 - Sets how many sources can do requests (updates, downloads) in parallel. Updates/Downloads are grouped by source and all mangas of a source are updated/downloaded synchronously |
 | **UPDATE_EXCLUDE_UNREAD** | `true` | If unread manga should be excluded from updates |
 | **UPDATE_EXCLUDE_STARTED** | `true` | If manga that haven't been started should be excluded from updates |