diff --git a/nixos/modules/config/i18n.nix b/nixos/modules/config/i18n.nix
index e341931aacce..d7fd38ebed9a 100644
--- a/nixos/modules/config/i18n.nix
+++ b/nixos/modules/config/i18n.nix
@@ -44,6 +44,7 @@ in
       consolePackages = mkOption {
         type = types.listOf types.package;
         default = with pkgs.kbdKeymaps; [ dvp neo ];
+        defaultText = ''with pkgs.kbdKeymaps; [ dvp neo ]'';
         description = ''
 	  List of additional packages that provide console fonts, keymaps and
           other resources.
diff --git a/nixos/modules/programs/java.nix b/nixos/modules/programs/java.nix
index 3292aa369d28..d31698c3b392 100644
--- a/nixos/modules/programs/java.nix
+++ b/nixos/modules/programs/java.nix
@@ -34,6 +34,7 @@ in
 
       package = mkOption {
         default = pkgs.jdk;
+        defaultText = "pkgs.jdk";
         description = ''
           Java package to install. Typical values are pkgs.jdk or pkgs.jre.
         '';
diff --git a/nixos/modules/services/continuous-integration/gocd-agent/default.nix b/nixos/modules/services/continuous-integration/gocd-agent/default.nix
index d60b55e83d11..05adb18fbe91 100644
--- a/nixos/modules/services/continuous-integration/gocd-agent/default.nix
+++ b/nixos/modules/services/continuous-integration/gocd-agent/default.nix
@@ -37,6 +37,7 @@ in {
 
       packages = mkOption {
         default = [ pkgs.stdenv pkgs.jre pkgs.git config.programs.ssh.package pkgs.nix ];
+        defaultText = "[ pkgs.stdenv pkgs.jre pkgs.git config.programs.ssh.package pkgs.nix ]";
         type = types.listOf types.package;
         description = ''
           Packages to add to PATH for the Go.CD agent process.
diff --git a/nixos/modules/services/continuous-integration/gocd-server/default.nix b/nixos/modules/services/continuous-integration/gocd-server/default.nix
index 4bb792055d25..07e00f17f1e8 100644
--- a/nixos/modules/services/continuous-integration/gocd-server/default.nix
+++ b/nixos/modules/services/continuous-integration/gocd-server/default.nix
@@ -68,6 +68,7 @@ in {
 
       packages = mkOption {
         default = [ pkgs.stdenv pkgs.jre pkgs.git config.programs.ssh.package pkgs.nix ];
+        defaultText = "[ pkgs.stdenv pkgs.jre pkgs.git config.programs.ssh.package pkgs.nix ]";
         type = types.listOf types.package;
         description = ''
           Packages to add to PATH for the Go.CD server's process.
diff --git a/nixos/modules/services/misc/dictd.nix b/nixos/modules/services/misc/dictd.nix
index 24dca15dd913..7e3b6431a133 100644
--- a/nixos/modules/services/misc/dictd.nix
+++ b/nixos/modules/services/misc/dictd.nix
@@ -25,7 +25,8 @@ in
       DBs = mkOption {
         type = types.listOf types.package;
         default = with pkgs.dictdDBs; [ wiktionary wordnet ];
-        example = [ pkgs.dictdDBs.nld2eng ];
+        defaultText = "with pkgs.dictdDBs; [ wiktionary wordnet ]";
+        example = literalExample "[ pkgs.dictdDBs.nld2eng ]";
         description = ''List of databases to make available.'';
       };
 
diff --git a/nixos/modules/services/misc/disnix.nix b/nixos/modules/services/misc/disnix.nix
index e5a125ad3245..e96645c79c77 100644
--- a/nixos/modules/services/misc/disnix.nix
+++ b/nixos/modules/services/misc/disnix.nix
@@ -41,6 +41,7 @@ in
         type = types.path;
         description = "The Disnix package";
         default = pkgs.disnix;
+        defaultText = "pkgs.disnix";
       };
 
     };
diff --git a/nixos/modules/services/misc/gitlab.nix b/nixos/modules/services/misc/gitlab.nix
index 3e4584c7a512..cb8fa901bbd2 100644
--- a/nixos/modules/services/misc/gitlab.nix
+++ b/nixos/modules/services/misc/gitlab.nix
@@ -164,18 +164,21 @@ in {
       packages.gitlab = mkOption {
         type = types.package;
         default = pkgs.gitlab;
+        defaultText = "pkgs.gitlab";
         description = "Reference to the gitlab package";
       };
 
       packages.gitlab-shell = mkOption {
         type = types.package;
         default = pkgs.gitlab-shell;
+        defaultText = "pkgs.gitlab-shell";
         description = "Reference to the gitlab-shell package";
       };
 
       packages.gitlab-workhorse = mkOption {
         type = types.package;
         default = pkgs.gitlab-workhorse;
+        defaultText = "pkgs.gitlab-workhorse";
         description = "Reference to the gitlab-workhorse package";
       };
 
diff --git a/nixos/modules/services/networking/flannel.nix b/nixos/modules/services/networking/flannel.nix
index 28b6c4f657dd..ca47a18bc1f6 100644
--- a/nixos/modules/services/networking/flannel.nix
+++ b/nixos/modules/services/networking/flannel.nix
@@ -20,6 +20,7 @@ in {
       description = "Package to use for flannel";
       type = types.package;
       default = pkgs.flannel.bin;
+      defaultText = "pkgs.flannel.bin";
     };
 
     publicIp = mkOption {
diff --git a/nixos/modules/services/networking/quassel.nix b/nixos/modules/services/networking/quassel.nix
index 3f0906fdb80d..edcc12170b20 100644
--- a/nixos/modules/services/networking/quassel.nix
+++ b/nixos/modules/services/networking/quassel.nix
@@ -26,10 +26,11 @@ in
       package = mkOption {
         type = types.package;
         default = pkgs.kde4.quasselDaemon;
+        defaultText = "pkgs.kde4.quasselDaemon";
         description = ''
           The package of the quassel daemon.
         '';
-        example = pkgs.quasselDaemon;
+        example = literalExample "pkgs.quasselDaemon";
       };
 
       interfaces = mkOption {
diff --git a/nixos/modules/services/search/hound.nix b/nixos/modules/services/search/hound.nix
index 1226cba682ec..a94a851e80ec 100644
--- a/nixos/modules/services/search/hound.nix
+++ b/nixos/modules/services/search/hound.nix
@@ -50,6 +50,8 @@ in {
 
       package = mkOption {
         default = pkgs.hound;
+        defaultText = "pkgs.hound";
+        type = types.package;
         description = ''
           Package for running hound.
         '';
diff --git a/nixos/modules/services/torrent/opentracker.nix b/nixos/modules/services/torrent/opentracker.nix
index d86b9fea2d79..74f443381d92 100644
--- a/nixos/modules/services/torrent/opentracker.nix
+++ b/nixos/modules/services/torrent/opentracker.nix
@@ -13,6 +13,7 @@ in {
         opentracker package to use
       '';
       default = pkgs.opentracker;
+      defaultText = "pkgs.opentracker";
     };
 
     extraOptions = mkOption {
diff --git a/nixos/modules/services/web-apps/quassel-webserver.nix b/nixos/modules/services/web-apps/quassel-webserver.nix
index 7de9480d4c46..d19e4bc58277 100644
--- a/nixos/modules/services/web-apps/quassel-webserver.nix
+++ b/nixos/modules/services/web-apps/quassel-webserver.nix
@@ -31,6 +31,8 @@ in {
       };
       pkg = mkOption {
         default = pkgs.quassel-webserver;
+        defaultText = "pkgs.quassel-webserver";
+        type = types.package;
         description = "The quassel-webserver package";
       };
       quasselCoreHost = mkOption {
diff --git a/nixos/modules/services/x11/compton.nix b/nixos/modules/services/x11/compton.nix
index bda4eec01026..7cbca1dcddfd 100644
--- a/nixos/modules/services/x11/compton.nix
+++ b/nixos/modules/services/x11/compton.nix
@@ -188,6 +188,7 @@ in {
     package = mkOption {
       type = types.package;
       default = pkgs.compton;
+      defaultText = "pkgs.compton";
       example = literalExample "pkgs.compton";
       description = ''
         Compton derivation to use.
diff --git a/nixos/modules/system/boot/plymouth.nix b/nixos/modules/system/boot/plymouth.nix
index 60a587af8e9f..d45b1686c1ea 100644
--- a/nixos/modules/system/boot/plymouth.nix
+++ b/nixos/modules/system/boot/plymouth.nix
@@ -51,6 +51,10 @@ in
           url = "https://nixos.org/logo/nixos-hires.png";
           sha256 = "1ivzgd7iz0i06y36p8m5w48fd8pjqwxhdaavc0pxs7w1g7mcy5si";
         };
+        defaultText = ''pkgs.fetchurl {
+          url = "https://nixos.org/logo/nixos-hires.png";
+          sha256 = "1ivzgd7iz0i06y36p8m5w48fd8pjqwxhdaavc0pxs7w1g7mcy5si";
+        }'';
         description = ''
           Logo which is displayed on the splash screen.
         '';