diff --git a/docs/add_net.md b/docs/add_net.md
index 3c326e8..0dec2a9 100644
--- a/docs/add_net.md
+++ b/docs/add_net.md
@@ -2,12 +2,12 @@
 
 ## Name
 
-	`add_net`
+`add_net`
 
 ## Synopsis
 
 ```
-	add_net ${card} ${vlan} ${group} [{no_ula|isp=abc|no_isp}...]
+add_net ${card} ${vlan} ${group} [{no_ula|isp=abc|no_isp}...]
 ```
 
 ## Description
@@ -37,3 +37,12 @@ at this time.)
 The `isp=...` flag can be used to assign the specified subnet to be part
 of the `IA_PD` list for the specified ISP.  The `no_isp` flag can be used to
 skip provisioning the specified network with any ISP's DHCPv6 `IA_PD` request.
+
+This calls [`add_v4_net`](add_v4_net.md) and [`add_v6_net`](add_v6_net.md) and
+passes all of its arguments.
+
+## See Also
+
+ - [`add_v4_net`](add_v4_net.md)
+ - [`add_v6_net`](add_v6_net.md)
+ - [`add_vlan`](add_vlan.md)
diff --git a/docs/add_v4_net.md b/docs/add_v4_net.md
new file mode 100644
index 0000000..28a7c4b
--- /dev/null
+++ b/docs/add_v4_net.md
@@ -0,0 +1,34 @@
+# `add_v4_net` Command
+
+## Name
+
+`add_v4_net`
+
+## Synopsis
+
+```
+add_v4_net ${card} ${vlan} ${group} [{no_ula|isp=abc|no_isp}...]
+```
+
+## Description
+
+Adds an internal network segment with the specified vlan on the specified
+card.  The created vlan-adaptor is put into the specified group.  It is setup
+for IPv4.
+
+The IPv4 network will be a `/24` under `${v4_net_xy0}` if `${card}` is
+`xy0`, for example.  If `${v4_net_xy0}` is not set, then `${v4_net}` is
+used by default.  The 3rd octet will be `$(( ${vlan}/10 + ${vlan}%10 ))`.  For
+example, if `${vlan}` is `102` and `${v4_net}` is `172.18`, then the configured
+v4 network will be `172.18.12.0/24` and the router will hold address
+`172.18.12.1`.  By default, IPv4 network DHCP configuration is enabled and
+the range `.100` to `.200` will be used as a dynamic allocation pool.
+
+Internally, this will call [`add_vlan`](add_vlan.md), passing it `${card}` and
+`${vlan}`.
+
+## See Also
+
+ - [`add_net`](add_net.md)
+ - [`add_v6_net`](add_v6_net.md)
+ - [`add_vlan`](add_vlan.md)
diff --git a/docs/add_v6_net.md b/docs/add_v6_net.md
index f54cedc..00084c8 100644
--- a/docs/add_v6_net.md
+++ b/docs/add_v6_net.md
@@ -2,7 +2,7 @@
 
 ## Name
 
-	`add_v6_net`
+`add_v6_net`
 
 ## Synopsis
 
@@ -33,3 +33,12 @@ skip provisioning the specified network with any ISP's DHCPv6 `IA_PD` request.
 Any desired explicit `/64` static prefixes can be configured on this network
 segment, after all other options.  The router will provision itself as `...::1`
 on those prefixes.
+
+Internally, this will call [`add_vlan`](add_vlan.md), passing it `${card}` and
+`${vlan}`.
+
+## See Also
+
+ - [`add_net`](add_net.md)
+ - [`add_v4_net`](add_v4_net.md)
+ - [`add_vlan`](add_vlan.md)
diff --git a/docs/add_vlan.md b/docs/add_vlan.md
new file mode 100644
index 0000000..401dae4
--- /dev/null
+++ b/docs/add_vlan.md
@@ -0,0 +1,26 @@
+# `add_vlan` Command
+
+## Name
+
+`add_vlan`
+
+## Synopsis
+
+```
+add_vlan ${card} ${vlan}
+```
+
+## Description
+
+Adds an internal network segment with the specified vlan on the specified
+card.  For example, `add_vlan xy0 123` has the effect of
+`vlans_xy0="${vlans_xy0} 123"`.
+
+The internal implementation prevents adding duplicate VLAN ID's to the same
+adaptor, by checking for their presence before adding.  It can safely be
+used alongside manual changes to `rc.conf` changes to these variables.
+
+## See Also
+ - [`add_net`](add_net.md)
+ - [`add_v4_net`](add_v4_net.md)
+ - [`add_v6_net`](add_v6_net.md)