diff --git a/nixos/modules/tasks/network-interfaces.nix b/nixos/modules/tasks/network-interfaces.nix
index 1faa8abd5f7..aaa78daeb3a 100644
--- a/nixos/modules/tasks/network-interfaces.nix
+++ b/nixos/modules/tasks/network-interfaces.nix
@@ -782,13 +782,12 @@ in
           };
 
           type = mkOption {
-            type = types.string;
+            type = types.enum [ "managed" "ibss" "monitor" "mesh" "wds" ];
             default = "managed";
             example = "ibss";
             description = ''
-              The type of the WLAN interface. The type has to be either <literal>managed</literal>,
-              <literal>ibss</literal>, <literal>monitor</literal>, <literal>mesh</literal> or <literal>wds</literal>.
-              Also, the type has to be supported by the underlying hardware of the device.
+              The type of the WLAN interface.
+              The type has to be supported by the underlying hardware of the device.
             '';
           };
 
@@ -799,17 +798,11 @@ in
           };
 
           flags = mkOption {
-            type = types.nullOr types.string;
+            type = with types; nullOr (enum [ "none" "fcsfail" "control" "otherbss" "cook" "active" ]);
             default = null;
             example = "control";
             description = ''
-              Flags for interface of type <literal>monitor</literal>. The valid flags are:
-              none:     no special flags
-              fcsfail:  show frames with FCS errors
-              control:  show control frames
-              otherbss: show frames from other BSSes
-              cook:     use cooked mode
-              active:   use active mode (ACK incoming unicast packets)
+              Flags for interface of type <literal>monitor</literal>.
             '';
           };