diff --git a/README b/README
index c80e78b..5b91139 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
 These filters will match various actions considered harmful or annoying in the
 area of e-mail delivery/fetching.
 
-Mostly, they will match only serious behaviour in order not to ban legitimate clients.
+Mostly, they will match only serious misbehaviour in order not to ban legitimate clients.