extbans: make tilde syntax more clear and add an example

diff --git a/content/kb/using/extbans.md b/content/kb/using/extbans.md
index 5425765438e93a9608c5615ab9fd4429b4d5cc6f..d40164a8a40f997943665a031d2af03a53bd8ae8 100644 (file)
--- a/content/kb/using/extbans.md
+++ b/content/kb/using/extbans.md
@@ -4,7 +4,8 @@ Title: Extbans
 Bans, quiets and invite and ban exemptions conventionally accept the format
 `nick!user@host`. On freenode another syntax, known as "extban", is accepted.
 These entries have the general format `$X` or `$X:data`. Optionally, they can
-be negated with a ~: `$~T`.
+be negated with a tilde (`~`) before the character: for example, `$~a` matches
+every user that is *not* identified to services.
 
 
 # Available extban types