diff --git a/Administration/config-yaml.md b/Administration/config-yaml.md
index c93ca0156..d7c1ea385 100644
--- a/Administration/config-yaml.md
+++ b/Administration/config-yaml.md
@@ -89,7 +89,8 @@ protocol:
 | `thumbnails.enabled` | Enable thumbnail generation | `true` | `true`, `false` |
 | `thumbnails.quality` | JPEG thumbnail quality | `95` | 0-100 |
 | `thumbnails.format` | Image format for thumbnails | `jpg` | `jpg`, `png` |
-| `thumbnails.dimensions` | Thumbnail sizes per type (width, height) | `{ 'bg': [160, 90], 'avatar': [96, 144] }` | Object (key: string, value: array of numbers) |
+| `thumbnails.dimensions.bg` | Background thumbnails size | `[160, 90]` | Array of two numbers (width, height) |
+| `thumbnails.dimensions.avatar` | Avatar thumbnails size | `[96, 144]` |  Array of two numbers (width, height) |
 
 ## Backup Configuration