diff --git a/README.md b/README.md
index 3fe99cc..60e309e 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,17 @@ Within Python Virtual Environment:
 
 3. Run `python getworld.py` to get all peers from your host and the whole world of fediverse's servers (or almost the whole world).
 
-4. Run `python fediverse.py` to query world alive servers API.
+4. Run `python fediverse.py` to query world alive servers API. It gets data from server's API according this table:
+
+|  Software  |        API        |       API       | API | API peers | API users |
+|:----------:|:-----------------:|:---------------:|:---:|:---------:|:---------:|
+| Diaspora   | nodeinfo/2.0.json |                 |     |           |           |
+| Friendica  | nodeinfo/2.0.json | api/v1/instance |     |           |           |
+| GNU Social |                   |                 |     |           |           |
+| Hubzilla   |                   |                 |     |           |           |
+| Mastodon   | nodeinfo/2.0.json | api/v1/instance |     |           |           |
+| Peertube   | nodeinfo/2.0.json |                 |     |           |           |
+| Pleroma    | nodeinfo/2.0.json | api/v1/instance |     |           |           |
 
 5. Use your favourite scheduling method to set ratio.py to run regularly.