diff --git a/docs/config.md b/docs/config.md
index 7177fe11da..685fc6c0e3 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -245,7 +245,7 @@ Currently, the following UI feature flags are supported:
    ```
       {
          range: 'Beginning' | 'Timeline' | 'LastNMessages',
-         sizeMb: number,
+         sizeMb: number, // max 100gb
          format: 'Html' | 'PlainText' | 'Json',
          numberOfMessages: number,
          includeAttachments: boolean,