diff --git a/setup/flavors/compose/mailu.env b/setup/flavors/compose/mailu.env
index 975e8136..8fac8ad9 100644
--- a/setup/flavors/compose/mailu.env
+++ b/setup/flavors/compose/mailu.env
@@ -29,7 +29,7 @@ POSTMASTER={{ postmaster }}
 # Choose how secure connections will behave (value: letsencrypt, cert, notls, mail, mail-letsencrypt)
 TLS_FLAVOR={{ tls_flavor }}
 
-# Authentication rate limit per IP (per /24 on ipv4 and /56 on ipv6)
+# Authentication rate limit per IP (per /24 on ipv4 and /48 on ipv6)
 {% if auth_ratelimit_ip > '0' %}
 AUTH_RATELIMIT_IP={{ auth_ratelimit_ip }}/hour
 {% endif %}