diff --git a/nixos/modules/config/krb5.nix b/nixos/modules/config/krb5.nix
index bb5a95ebc84..991b5b16cc6 100644
--- a/nixos/modules/config/krb5.nix
+++ b/nixos/modules/config/krb5.nix
@@ -32,12 +32,12 @@ in
 
       kdc = mkOption {
         default = "kerberos.mit.edu";
-        description = "Kerberos Domain Controller";
+        description = "Kerberos Domain Controller.";
       };
 
       kerberosAdminServer = mkOption {
         default = "kerberos.mit.edu";
-        description = "Kerberos Admin Server";
+        description = "Kerberos Admin Server.";
       };
 
     };
diff --git a/nixos/modules/programs/atop.nix b/nixos/modules/programs/atop.nix
index e457db22333..b91bd98047e 100644
--- a/nixos/modules/programs/atop.nix
+++ b/nixos/modules/programs/atop.nix
@@ -22,7 +22,7 @@ in
           interval = 5;
         };
         description = ''
-          Parameters to be written to <filename>/etc/atoprc</filename>
+          Parameters to be written to <filename>/etc/atoprc</filename>.
         '';
       };
 
diff --git a/nixos/modules/services/databases/redis.nix b/nixos/modules/services/databases/redis.nix
index 4ef48df9831..2521e356bf3 100644
--- a/nixos/modules/services/databases/redis.nix
+++ b/nixos/modules/services/databases/redis.nix
@@ -50,7 +50,7 @@ in
 
       user = mkOption {
         default = "redis";
-        description = "User account under which Redis runs";
+        description = "User account under which Redis runs.";
       };
 
       pidFile = mkOption {
@@ -60,26 +60,26 @@ in
 
       port = mkOption {
         default = 6379;
-        description = "The port for Redis to listen to";
+        description = "The port for Redis to listen to.";
         type = with types; int;
       };
 
       bind = mkOption {
         default = null; # All interfaces
-        description = "The IP interface to bind to";
+        description = "The IP interface to bind to.";
         example = "127.0.0.1";
       };
 
       unixSocket = mkOption {
         default = null;
-        description = "The path to the socket to bind to";
+        description = "The path to the socket to bind to.";
         example = "/var/run/redis.sock";
       };
 
       logLevel = mkOption {
         default = "notice"; # debug, verbose, notice, warning
         example = "debug";
-        description = "Specify the server verbosity level, options: debug, verbose, notice, warning";
+        description = "Specify the server verbosity level, options: debug, verbose, notice, warning.";
         type = with types; string;
       };
 
@@ -110,19 +110,19 @@ in
 
       dbFilename = mkOption {
         default = "dump.rdb";
-        description = "The filename where to dump the DB";
+        description = "The filename where to dump the DB.";
         type = with types; string;
       };
 
       dbpath = mkOption {
         default = "/var/lib/redis";
-        description = "The DB will be written inside this directory, with the filename specified using the 'dbFilename' configuration";
+        description = "The DB will be written inside this directory, with the filename specified using the 'dbFilename' configuration.";
         type = with types; string;
       };
 
       slaveOf = mkOption {
         default = null; # { ip, port }
-        description = "An attribute set with two attributes: ip and port to which this redis instance acts as a slave";
+        description = "An attribute set with two attributes: ip and port to which this redis instance acts as a slave.";
         example = { ip = "192.168.1.100"; port = 6379; };
       };
 
@@ -154,26 +154,26 @@ in
 
       appendFsync = mkOption {
         default = "everysec"; # no, always, everysec
-        description = "How often to fsync the append-only log, options: no, always, everysec";
+        description = "How often to fsync the append-only log, options: no, always, everysec.";
         type = with types; string;
       };
 
       slowLogLogSlowerThan = mkOption {
         default = 10000;
-        description = "Log queries whose execution take longer than X in milliseconds";
+        description = "Log queries whose execution take longer than X in milliseconds.";
         example = 1000;
         type = with types; int;
       };
 
       slowLogMaxLen = mkOption {
         default = 128;
-        description = "Maximum number of items to keep in slow log";
+        description = "Maximum number of items to keep in slow log.";
         type = with types; int;
       };
 
       extraConfig = mkOption {
         default = "";
-        description = "Extra configuration options for redis.conf";
+        description = "Extra configuration options for redis.conf.";
         type = with types; string;
       };
     };
diff --git a/nixos/modules/tasks/encrypted-devices.nix b/nixos/modules/tasks/encrypted-devices.nix
index e80762a170c..e56549149cb 100644
--- a/nixos/modules/tasks/encrypted-devices.nix
+++ b/nixos/modules/tasks/encrypted-devices.nix
@@ -16,28 +16,28 @@ let
       enable = mkOption {
         default = false;
         type = types.bool;
-        description = "The block device is backed by an encrypted one, adds this device as a initrd luks entry";
+        description = "The block device is backed by an encrypted one, adds this device as a initrd luks entry.";
       };
 
       blkDev = mkOption {
         default = null;
         example = "/dev/sda1";
         type = types.uniq (types.nullOr types.string);
-        description = "Location of the backing encrypted device";
+        description = "Location of the backing encrypted device.";
       };
 
       label = mkOption {
         default = null;
         example = "rootfs";
         type = types.uniq (types.nullOr types.string);
-        description = "Label of the backing encrypted device";
+        description = "Label of the backing encrypted device.";
       };
 
       keyFile = mkOption {
         default = null;
         example = "/root/.swapkey";
         type = types.uniq (types.nullOr types.string);
-        description = "File system location of keyfile";
+        description = "File system location of keyfile.";
       };
     };
   };