IRC-Documentation/doc/prefixing.md

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# Colon prefixing

In some commands (like PRIVMSG, TOPIC, USER, NOTICE, etc), the client needs to add a colon before the content (NOT after the command)

❌ Your client shouldn't do this:
```
↗️ PRIVMSG foo this is a very cool message
🔀 nick!ident@host PRIVMSG foo :this
```
The server will only detect the first word


❌ Your client shouldn't do this either:
```
↗️ PRIVMSG foo: this is a very cool message
↙️ :server 401 nick foo: :No such nick/channel
```
The server will think that the nickname ends with a colon.


✅ Here's what it should do:
```
↗️ PRIVMSG foo :this is a very cool message
🔀 nick!ident@host PRIVMSG foo :this is a very cool message
```