diff --git a/doc/specifications-support.md b/doc/specifications-support.md
index 0d335738..cd7869e1 100644
--- a/doc/specifications-support.md
+++ b/doc/specifications-support.md
@@ -2,52 +2,58 @@
 
 This document explains which attributes are supported by feed-io and how to access them
 
-## top level document : feed (atom) / channel (rss)
+## top level document : feed (atom) / channel (rss) / top-level (json)
 
 interface : FeedInterface
 
-| atom        | rss                     | getter          | setter          |
-| ----------- | ----------------------- | --------------- | --------------- |
-| title       | title                   | getTitle        | setTitle        |
-| link        | link                    | getLink         | setLink         |
-| updated     | pubDate / lastBuildDate | getLastModified | setLastModified |
-| id          | N/A                     | getPublicId     | setPublicId     |
-| N/A         | description             | getDescription  | setDescription  |
-| category    | category                | getCategories   | addCategory     |
-| author      | author                  | getAuthor       | setAuthor       |
-| contributor | N/A                     | not supported   | not supported   |
-| logo        | image                   | getLogo         | setLogo         |
-| rights      | copyright               | not supported   | not supported   |
-| subtitle    | N/A                     | not supported   | not supported   |
-| lang        | language                | getLanguage     | setLanguage     |
-| base        | N/A                     | not supported   | not supported   |
-| generator   | generator               | not supported   | not supported   |
-| N/A         | managingEditor          | not supported   | not supported   |
-| N/A         | webMaster               | not supported   | not supported   |
-| N/A         | docs                    | not supported   | not supported   |
-| N/A         | cloud                   | not supported   | not supported   |
-| N/A         | ttl                     | not supported   | not supported   |
-| N/A         | rating                  | not supported   | not supported   |
-| N/A         | textInput               | not supported   | not supported   |
-| N/A         | skipdays                | not supported   | not supported   |
-| N/A         | skipHours               | not supported   | not supported   |
+| atom            | rss                     | json          | getter          | setter          |
+| --------------- | ----------------------- | ------------- | --------------- | --------------- |
+| title           | title                   | title         | getTitle        | setTitle        |
+| link            | link                    | home_page_url | getLink         | setLink         |
+| link (rel=self) | N/A                     | feed_url      | getLink         | setLink         |
+| updated         | pubDate / lastBuildDate | N/A           | getLastModified | setLastModified |
+| id              | N/A                     | N/A           | getPublicId     | setPublicId     |
+| N/A             | description             | description   | getDescription  | setDescription  |
+| category        | category                | N/A           | getCategories   | addCategory     |
+| author          | author                  | author (wip)  | getAuthor       | setAuthor       |
+| contributor     | N/A                     | N/A           | not supported   | not supported   |
+| logo            | image                   | icon          | getLogo         | setLogo         |
+| rights          | copyright               | N/A           | not supported   | not supported   |
+| subtitle        | N/A                     | N/A           | not supported   | not supported   |
+| lang            | language                | N/A           | getLanguage     | setLanguage     |
+| base            | N/A                     | N/A           | not supported   | not supported   |
+| generator       | generator               | N/A           | not supported   | not supported   |
+| N/A             | managingEditor          | N/A           | not supported   | not supported   |
+| N/A             | webMaster               | N/A           | not supported   | not supported   |
+| N/A             | docs                    | N/A           | not supported   | not supported   |
+| N/A             | cloud                   | hubs          | not supported   | not supported   |
+| N/A             | ttl                     | N/A           | not supported   | not supported   |
+| N/A             | rating                  | N/A           | not supported   | not supported   |
+| N/A             | textInput               | N/A           | not supported   | not supported   |
+| N/A             | skipdays                | N/A           | not supported   | not supported   |
+| N/A             | skipHours               | N/A           | not supported   | not supported   |
+| N/A             | N/A                     | expired       | not supported   | not supported   |
 
-## entry (atom) / item (rss)
+## entry (atom) / item (rss) / item (json)
 
 Interface : ItemInterface
 
-| atom                | rss         | getter          | setter          |
-| ------------------- | ----------- | --------------- | --------------- |
-| title               | title       | getTitle        | setTitle        |
-| link                | link        | getLink         | setLink         |
-| link                | enclosure   | getMedias       | addMedia        |
-| updated / published | pubDate     | getLastModified | setLastModified |
-| id                  | guid        | getPublicId     | setPublicId     |
-| content             | description | getDescription  | setDescription  |
-| summary             | N/A         | not supported   | not supported   |
-| source              | source      | not supported   | not supported   |
-| category            | category    | getCategories   | addCategory     |
-| author              | N/A         | getAuthor       | setAuthor       |
-| contributor         | N/A         | not supported   | not supported   |
-| N/A                 | comments    | not supported   | not supported   |
-| rights              | N/A         | not supported   | not supported   |
+| atom                | rss         | json                        | getter          | setter          |
+| ------------------- | ----------- | --------------------------- | --------------- | --------------- |
+| title               | title       | title                       | getTitle        | setTitle        |
+| link                | link        | url                         | getLink         | setLink         |
+| link                | enclosure   | image (get only)            | getMedias       | addMedia        |
+| updated / published | pubDate     | date_published              | getLastModified | setLastModified |
+| id                  | guid        | id                          | getPublicId     | setPublicId     |
+| content             | description | content_html / content_text | getDescription  | setDescription  |
+| summary             | N/A         | summary                     | not supported   | not supported   |
+| source              | source      | N/A                         | not supported   | not supported   |
+| category            | category    | tags (wip)                  | getCategories   | addCategory     |
+| author              | N/A         | author                      | getAuthor       | setAuthor       |
+| contributor         | N/A         | N/A                         | not supported   | not supported   |
+| N/A                 | comments    | N/A                         | not supported   | not supported   |
+| rights              | N/A         | N/A                         | not supported   | not supported   |
+| N/A                 | N/A         | external_url                | not supported   | not supported   |
+| N/A                 | N/A         | banner_image                | not supported   | not supported   |
+| N/A                 | N/A         | attachments                 | not supported   | not supported   |
+| N/A                 | N/A         | date_modified               | not supported   | not supported   |
\ No newline at end of file