diff --git a/docs/cookbook.md b/docs/cookbook.md
index 57536d0c..5f0685f9 100644
--- a/docs/cookbook.md
+++ b/docs/cookbook.md
@@ -251,7 +251,7 @@ involved. Here is a basic configuration:
     end: "192.168.24.10",
     options: %{
       dns: ["1.1.1.1", "1.0.0.1"],
-      subnet: "192.168.24.255",
+      subnet: "255.255.255.0",
       router: ["192.168.24.1"]
     }
   }
diff --git a/lib/vintage_net/ip/dhcpd_config.ex b/lib/vintage_net/ip/dhcpd_config.ex
index 230894f4..8e3a828f 100644
--- a/lib/vintage_net/ip/dhcpd_config.ex
+++ b/lib/vintage_net/ip/dhcpd_config.ex
@@ -22,7 +22,7 @@ defmodule VintageNet.IP.DhcpdConfig do
     * `:router` - IP_LIST
     * `:search` - STRING_LIST - [0x77] search domains
     * `:serverid` - IP (defaults to the interface's IP address)
-    * `:subnet` - IP (as a subnet mask)
+    * `:subnet` or `:netmask` - IP as a subnet mask (`:netmask` is an alias for `:subnet`)
 
   > #### :options {: .info}
   > Options may also be passed in as integers. These are passed directly to the DHCP server
@@ -47,7 +47,7 @@ defmodule VintageNet.IP.DhcpdConfig do
         end: "192.168.24.10",
         options: %{
           dns: ["1.1.1.1", "1.0.0.1"],
-          subnet: "192.168.24.255",
+          netmask: "255.255.255.0",
           router: ["192.168.24.1"]
         }
       }
@@ -113,6 +113,10 @@ defmodule VintageNet.IP.DhcpdConfig do
 
   defp normalize_options(dhcpd_config), do: dhcpd_config
 
+  # Support :netmask as an alias to :subnet in v0.13.2. This makes
+  # the configuration more consistent with `:ipv4` options.
+  defp normalize_option({:netmask, ip}), do: normalize_option({:subnet, ip})
+
   defp normalize_option({ip_option, ip})
        when ip_option in @ip_options do
     {ip_option, IP.ip_to_tuple!(ip)}
diff --git a/test/vintage_net/ip/dhcpd_config_test.exs b/test/vintage_net/ip/dhcpd_config_test.exs
index ccafef1f..d9c875dc 100644
--- a/test/vintage_net/ip/dhcpd_config_test.exs
+++ b/test/vintage_net/ip/dhcpd_config_test.exs
@@ -34,6 +34,7 @@ defmodule VintageNet.IP.DhcpdConfigTest do
           :mtu => 9216,
           :serverid => {192, 168, 1, 1},
           :hostname => "marshmallow",
+          :subnet => "255.255.255.0",
           0x08 => "01020304"
         }
       }
@@ -58,6 +59,7 @@ defmodule VintageNet.IP.DhcpdConfigTest do
           :hostname => "marshmallow",
           :mtu => 9216,
           :serverid => {192, 168, 1, 1},
+          :subnet => {255, 255, 255, 0},
           8 => "01020304"
         }
       }
@@ -66,6 +68,28 @@ defmodule VintageNet.IP.DhcpdConfigTest do
     assert normalized_config == DhcpdConfig.normalize(config)
   end
 
+  test "dhcpd netmask is an alias for subnet" do
+    config = %{
+      dhcpd: %{
+        start: "192.168.1.2",
+        end: "192.168.1.100",
+        options: %{
+          netmask: "255.255.255.0"
+        }
+      }
+    }
+
+    normalized_config = %{
+      dhcpd: %{
+        start: {192, 168, 1, 2},
+        end: {192, 168, 1, 100},
+        options: %{subnet: {255, 255, 255, 0}}
+      }
+    }
+
+    assert normalized_config == DhcpdConfig.normalize(config)
+  end
+
   test "normalize fixes item passed instead of list" do
     # Pass an IP address rather than a list for the DNS option
     config = %{