diff --git a/README.md b/README.md
index f0df79b..0a089d3 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,34 @@ cargo build # build
 cargo run   # run
 ```
 
+## extensions
+
+### colored usernames
+
+#### bRAC
+
+regex - `\[(.*?)\] \uB9AC\u3E70<(.*?)> (.*)` \
+color - green \
+example - `[date] 리㹰<nick> text`
+
+#### CRAB
+
+regex - `\[(.*?)\] \u2550\u2550\u2550<(.*?)> (.*)` \
+color - light red \
+example - `[date] ═══<nick> text`
+
+#### Mefedroniy
+
+regex - `\[(.*?)\] (.*?): (.*)` \
+color - light magenta \
+example - `[date] nick: text`
+
+#### clRAC
+
+regex - `\[(.*?)\] <(.*?)> (.*)` \
+color - cyan \
+example - `[date] <nick> text`
+
 ## see also
 
 - [CRAB - client & server for RAC](https://gitea.bedohswe.eu.org/pixtaded/crab)
diff --git a/src/main.rs b/src/main.rs
index ca35035..aa8f843 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,7 +9,7 @@ use termion::{event::Key, input::TermRead, raw::IntoRawMode};
 
 const MAX_MESSAGES: usize = 100;
 const DEFAULT_HOST: &str = "meex.lol:11234";
-const MAGIC_KEY: &str = "리㹰";
+const MAGIC_KEY: &str = "\u{B9AC}\u{3E70}";
 
 fn send_message(host: &str, message: &str) -> Result<(), Box<dyn Error>> {
     let mut stream = TcpStream::connect(host)?;