diff --git a/README.md b/README.md
index 04e2fad..8d9fc20 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,7 @@ messages starting with a slash are sent to chat only if the `--disable-commands`
 - [User agents](docs/user_agents.md)
 - [Authenticated mode](docs/auth_mode.md)
 - [WRAC protocol (v2.0)](docs/wrac.md)
+- [About RAC URL](docs/url.md)
 - [FAQ](docs/faq.md)
 
 ## see also
diff --git a/docs/url.md b/docs/url.md
new file mode 100644
index 0000000..402abc3
--- /dev/null
+++ b/docs/url.md
@@ -0,0 +1,16 @@
+# How does RAC URL work?
+
+RAC URL is used in sRAC and bRAC as the default way of specifying host, running a RAC or WRAC server.
+
+Format of RAC URL:
+
+```
+<protocol>://<address>[:<port>]
+```
+
+Protocol can be one of these:
+
+|  | **SSL** | **No SSL** |
+| :--: | :--: | :--: |
+| **WebSocket** | wracs:// | wrac:// |
+| **No Websocket** | racs:// | rac:// |
\ No newline at end of file