diff --git a/README.md b/README.md
index 35e892e..897b2da 100644
--- a/README.md
+++ b/README.md
@@ -52,9 +52,16 @@ realm --zone ./domain.zone
 
 By default `realm` binds to port `53`, which usually requires root, so you may need to run `sudo realm --zone ./domain.zone`.
 
+You can also specify any number of zone files by providing `--zone` multiple times:
+
+```
+realm --zone ./first.domain.zone --zone ./second.domain.zone
+```
+
 ### Options
 * `--zone, -z` - the file file to load (e.g. `./domain.zone`), this argument is required
     * You may instead specify the environment variable `REALM_ZONE="./domain.zone"`
+    * You may specify `--zone` and `REALM_ZONE` multiple times
 * `--bind, -b` - the `[<host>]:<port>` to bind the server to (e.g. `0.0.0.0:53`), default is `:53`
     * You may instead specify the environment variable `REALM_BIND=":53"`
 * `--help, -h` - show help message
diff --git a/doc.go b/doc.go
index f352a89..28fb8ab 100644
--- a/doc.go
+++ b/doc.go
@@ -14,6 +14,7 @@ Realm will parse your server configuration from a DNS zone file see https://en.w
 To start a server:
 
     realm --zone ./domain.zone
+    realm --zone ./first.domain.zone --zone ./second.domain.zone --bind "127.0.0.1:1053"
 
 Full command usage:
 
@@ -30,9 +31,9 @@ Full command usage:
        help, h	Shows a list of commands or help for one command
 
     GLOBAL OPTIONS:
-       --zone, -z 		location to DNS zone file [required] [$REALM_ZONE]
-       --bind, -b ':53'	'[<host>]:<port>' to bind too [$REALM_BIND]
-       --help, -h		show help
-       --version, -v	print the version
+       --zone, -z '--zone option --zone option'	location to DNS zone file [required] [$REALM_ZONE]
+       --bind, -b ':53'				'[<host>]:<port>' to bind too [$REALM_BIND]
+       --help, -h					show help
+       --version, -v				print the version
 */
 package realm