diff --git a/ddclient.conf.in b/ddclient.conf.in
index 756aec3..c4d5172 100644
--- a/ddclient.conf.in
+++ b/ddclient.conf.in
@@ -301,8 +301,9 @@ ssl=yes					# use ssl-support.  Works with
 # protocol=porkbun
 # apikey=APIKey
 # secretapikey=SecretAPIKey
+# root-domain=example.com
 # host.example.com,host2.sub.example.com
-# on-root-domain=yes example.com,sub.example.com
+# example.com,sub.example.com
 
 ##
 ## ClouDNS (https://www.cloudns.net)
diff --git a/ddclient.in b/ddclient.in
index dfe6a7d..b417b0e 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -7119,6 +7119,7 @@ Available configuration variables:
   * on-root-domain=yes or no (default: no): Indicates whether the specified domain name (FQDN) is
     an unnamed record (Zone APEX) in a zone.
     It is useful to specify it as a local variable as shown in the example.
+    This configuration value is deprecated, use root-domain instead!
   * usev4, usev6 : These configuration variables can be specified as local variables to override
     the global settings. It is useful to finely control IPv4 or IPv6 as shown in the example.
   * use (deprecated) : This parameter is deprecated but can be overridden like the above parameters.
@@ -7126,13 +7127,19 @@ Available configuration variables:
 Limitations:
   * Multiple same name records (for round robin) are not supported.
     The same IP address is set for all, creating meaningless extra records.
+  * If neither root-domain nor on-root-domain are specified, ${program} will split the given
+    hostname into subdomain and domain on the first dot.
+    For example:
+      * sub.example.com -> Subdomain "sub", root domain "example.com"
+      * sub.foo.example.com -> Subdomain "sub", root domain "foo.example.com"
+    If both root-domain and on-root-domain are specified, root-domain takes precedence.
 
 Example ${program}.conf file entry:
   protocol=porkbun
   apikey=APIKey
   secretapikey=SecretAPIKey
-  host.example.com,host2.sub.example.com
-  on-root-domain=yes example.com,sub.example.com
+  root-domain=example.com
+  example.com,host.example.com,host2.sub.example.com
 
 Additional example to finely control IPv4 or IPv6 :
   # Example 01 : Global enable both IPv4 and IPv6, and update both records.
@@ -7142,6 +7149,7 @@ Additional example to finely control IPv4 or IPv6 :
   protocol=porkbun
   apikey=APIKey
   secretapikey=SecretAPIKey
+  root-domain=example.com
   host.example.com,host2.sub.example.com
 
   # Example 02 : Global enable only IPv4, and update only IPv6 record.
@@ -7150,8 +7158,16 @@ Additional example to finely control IPv4 or IPv6 :
   protocol=porkbun
   apikey=APIKey
   secretapikey=SecretAPIKey
+  root-domain=example.com
   usev6=ifv6, ifv6=enp1s0, usev4=disabled ipv6.example.com
 
+  # Example 03: Update just a root domain
+  protocol=porkbun
+  apikey=APIKey
+  secretapikey=SecretAPIKey
+  root-domain=host.example.com
+  host.example.com
+
 EoEXAMPLE
 }