diff --git a/doc/configuration.txt b/doc/configuration.txt
index 85efdc403..3a3ddcc41 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -507,6 +507,10 @@ log <address> <facility> [max level [min level]]
           no port is specified, 514 is used by default (the standard syslog
           port).
 
+        - An IPv6 address followed by a colon and optionally a UDP port. If
+          no port is specified, 514 is used by default (the standard syslog
+          port).
+
         - A filesystem path to a UNIX domain socket, keeping in mind
           considerations for chroot (be sure the path is accessible inside
           the chroot) and uid/gid (be sure the path is appropriately
@@ -2522,6 +2526,10 @@ log <address> <facility> [<level> [<minlevel>]]
                  port. If no port is specified, 514 is used by default (the
                  standard syslog port).
 
+               - An IPv6 address followed by a colon (':') and optionally a UDP
+                 port. If no port is specified, 514 is used by default (the
+                 standard syslog port).
+
                - A filesystem path to a UNIX domain socket, keeping in mind
                  considerations for chroot (be sure the path is accessible
                  inside the chroot) and uid/gid (be sure the path is