diff --git a/nixos/modules/services/backup/bacula.nix b/nixos/modules/services/backup/bacula.nix
index cb8a6eb4390c..d4f6ac8f5d37 100644
--- a/nixos/modules/services/backup/bacula.nix
+++ b/nixos/modules/services/backup/bacula.nix
@@ -195,7 +195,7 @@ let
       };
 
       devices = mkOption {
-        description = "";
+        description = lib.mdDoc "";
         type = types.listOf types.str;
       };
 
diff --git a/nixos/modules/services/cluster/hadoop/default.nix b/nixos/modules/services/cluster/hadoop/default.nix
index 9139b9eb734d..72bf25c21146 100644
--- a/nixos/modules/services/cluster/hadoop/default.nix
+++ b/nixos/modules/services/cluster/hadoop/default.nix
@@ -203,7 +203,7 @@ with lib;
       type = types.package;
       default = pkgs.hadoop;
       defaultText = literalExpression "pkgs.hadoop";
-      description = "";
+      description = lib.mdDoc "";
     };
   };
 
diff --git a/nixos/modules/services/mail/postfix.nix b/nixos/modules/services/mail/postfix.nix
index 4868a57ee64c..5461e89a801d 100644
--- a/nixos/modules/services/mail/postfix.nix
+++ b/nixos/modules/services/mail/postfix.nix
@@ -70,7 +70,7 @@ let
       privileged = mkOption {
         type = types.bool;
         example = true;
-        description = "";
+        description = lib.mdDoc "";
       };
 
       chroot = mkOption {
diff --git a/nixos/modules/services/networking/quicktun.nix b/nixos/modules/services/networking/quicktun.nix
index e2282b9aaf7c..7aed972adc88 100644
--- a/nixos/modules/services/networking/quicktun.nix
+++ b/nixos/modules/services/networking/quicktun.nix
@@ -20,65 +20,65 @@ with lib;
             type = types.int;
             default = 0;
             example = 1;
-            description = "";
+            description = lib.mdDoc "";
           };
 
           remoteAddress = mkOption {
             type = types.str;
             example = "tunnel.example.com";
-            description = "";
+            description = lib.mdDoc "";
           };
 
           localAddress = mkOption {
             type = types.str;
             example = "0.0.0.0";
-            description = "";
+            description = lib.mdDoc "";
           };
 
           localPort = mkOption {
             type = types.int;
             default = 2998;
-            description = "";
+            description = lib.mdDoc "";
           };
 
           remotePort = mkOption {
             type = types.int;
             default = 2998;
-            description = "";
+            description = lib.mdDoc "";
           };
 
           remoteFloat = mkOption {
             type = types.int;
             default = 0;
-            description = "";
+            description = lib.mdDoc "";
           };
 
           protocol = mkOption {
             type = types.str;
             default = "nacltai";
-            description = "";
+            description = lib.mdDoc "";
           };
 
           privateKey = mkOption {
             type = types.str;
-            description = "";
+            description = lib.mdDoc "";
           };
 
           publicKey = mkOption {
             type = types.str;
-            description = "";
+            description = lib.mdDoc "";
           };
 
           timeWindow = mkOption {
             type = types.int;
             default = 5;
-            description = "";
+            description = lib.mdDoc "";
           };
 
           upScript = mkOption {
             type = types.lines;
             default = "";
-            description = "";
+            description = lib.mdDoc "";
           };
         };
       });
diff --git a/nixos/modules/services/networking/xinetd.nix b/nixos/modules/services/networking/xinetd.nix
index 2b96032bc948..2ec0cd18dcba 100644
--- a/nixos/modules/services/networking/xinetd.nix
+++ b/nixos/modules/services/networking/xinetd.nix
@@ -105,7 +105,7 @@ in
           flags = mkOption {
             type = types.str;
             default = "";
-            description = "";
+            description = lib.mdDoc "";
           };
 
           unlisted = mkOption {
diff --git a/nixos/modules/services/torrent/transmission.nix b/nixos/modules/services/torrent/transmission.nix
index 28ff015ee8e9..c18ac89cfbd0 100644
--- a/nixos/modules/services/torrent/transmission.nix
+++ b/nixos/modules/services/torrent/transmission.nix
@@ -71,7 +71,7 @@ in
           options.incomplete-dir-enabled = mkOption {
             type = types.bool;
             default = true;
-            description = "";
+            description = lib.mdDoc "";
           };
           options.message-level = mkOption {
             type = types.ints.between 0 3;
diff --git a/nixos/modules/system/boot/loader/raspberrypi/raspberrypi.nix b/nixos/modules/system/boot/loader/raspberrypi/raspberrypi.nix
index 426aa021c8bf..1dde55074336 100644
--- a/nixos/modules/system/boot/loader/raspberrypi/raspberrypi.nix
+++ b/nixos/modules/system/boot/loader/raspberrypi/raspberrypi.nix
@@ -58,7 +58,7 @@ in
       version = mkOption {
         default = 2;
         type = types.enum [ 0 1 2 3 4 ];
-        description = "";
+        description = lib.mdDoc "";
       };
 
       uboot = {