diff --git a/docs/redoc-vendor-extensions.md b/docs/redoc-vendor-extensions.md
index 8985bf6b..4f012fd2 100644
--- a/docs/redoc-vendor-extensions.md
+++ b/docs/redoc-vendor-extensions.md
@@ -93,7 +93,7 @@ The information about API logo
 ###### Fixed fields
 | Field Name      |	Type	   | Description |
 | :-------------- | :------: | :---------- |
-| url             | string   | The URL pointing to the spec logo. MUST be in the format of a URL
+| url             | string   | The URL pointing to the spec logo. MUST be in the format of a URL. It SHOULD be an absolute URL so your API definition is usable from any location
 | backgroundColor | string   | background color to be used. MUST be RGB color in [hexadecimal format] (https://en.wikipedia.org/wiki/Web_colors#Hex_triplet)