diff --git a/modules/common/applications/kitty.nix b/modules/common/applications/kitty.nix
index fe2ccef..da993c7 100644
--- a/modules/common/applications/kitty.nix
+++ b/modules/common/applications/kitty.nix
@@ -40,7 +40,10 @@
         extraConfig = "";
         font.size = 14;
         keybindings = {
+          # Use shift+enter to complete text suggestions in fish
           "shift+enter" = "send_text all \\x1F";
+
+          # Easy fullscreen toggle (for macOS)
           "super+f" = "toggle_fullscreen";
         };
         settings = {
@@ -98,7 +101,7 @@
           tab_bar_edge = "top";
           tab_bar_style = "slant";
 
-          # Audio
+          # Disable audio
           enable_audio_bell = false;
         };
       };
diff --git a/modules/common/applications/media.nix b/modules/common/applications/media.nix
index 279042b..edd2bc2 100644
--- a/modules/common/applications/media.nix
+++ b/modules/common/applications/media.nix
@@ -22,8 +22,8 @@
         enable = true;
         bindings = { };
         config = {
-          image-display-duration = 2;
-          hwdec = "auto-safe";
+          image-display-duration = 2; # For cycling through images
+          hwdec = "auto-safe"; # Attempt to use GPU decoding for video
         };
         scripts = [
 
@@ -49,7 +49,7 @@
         ];
       };
 
-      # Set default for opening PDFs
+      # Set default programs for opening PDFs and other media
       xdg.mimeApps = {
         associations.added = {
           "application/pdf" = [ "pwmt.zathura-cb.desktop" ];
diff --git a/modules/common/mail/default.nix b/modules/common/mail/default.nix
index 82c1b15..a98f4b3 100644
--- a/modules/common/mail/default.nix
+++ b/modules/common/mail/default.nix
@@ -27,19 +27,31 @@
 
     home-manager.users.${config.user} = {
       programs.mbsync = { enable = true; };
+
+      # Automatically check for mail and keep files synced locally
       services.mbsync = lib.mkIf pkgs.stdenv.isLinux {
         enable = true;
         frequency = "*:0/5";
         postExec = "${pkgs.notmuch}/bin/notmuch new";
       };
+
+      # Used to watch for new mail and trigger sync
       services.imapnotify.enable = pkgs.stdenv.isLinux;
+
+      # Allows sending email from CLI/sendmail
       programs.msmtp.enable = true;
+
+      # Better local mail search
       programs.notmuch = {
         enable = true;
         new.ignore = [ ".mbsyncstate.lock" ".mbsyncstate.journal" ];
       };
+
       accounts.email = {
+
+        # Where email files are stored
         maildirBasePath = "${config.homePath}/mail";
+
         accounts = {
           home = let address = "${config.mail.user}@${config.mail.server}";
           in {
@@ -52,13 +64,17 @@
               "hey"
               "admin"
             ];
+
+            # Options for contact completion
             alot = { };
-            flavor = "plain";
+
             imap = {
               host = config.mail.imapHost;
               port = 993;
               tls.enable = true;
             };
+
+            # Watch for mail and run notifications or sync
             imapnotify = {
               enable = true;
               boxes = [ "Inbox" ];
@@ -67,7 +83,11 @@
                 config.home-manager.users.${config.user}.services.dunst.enable
                 "${pkgs.libnotify}/bin/notify-send 'New mail arrived'";
             };
+
+            # Name of the directory in maildir for this account
             maildir = { path = "main"; };
+
+            # Bi-directional syncing options for local files
             mbsync = {
               enable = true;
               create = "both";
@@ -78,12 +98,17 @@
                 CopyArrivalDate = "yes"; # Sync time of original message
               };
             };
+
+            # Enable indexing
             notmuch.enable = true;
+
+            # Used to login and send and receive emails
             passwordCommand =
               "${pkgs.age}/bin/age --decrypt --identity ${config.identityFile} ${
                 pkgs.writeText "mailpass.age"
                 (builtins.readFile ../../../private/mailpass.age)
               }";
+
             smtp = {
               host = config.mail.smtpHost;
               port = 465;
diff --git a/modules/common/neovim/config/align.nix b/modules/common/neovim/config/align.nix
index 37abafe..382f75e 100644
--- a/modules/common/neovim/config/align.nix
+++ b/modules/common/neovim/config/align.nix
@@ -1,4 +1,7 @@
 { pkgs, ... }: {
+
+  # Plugin for aligning text programmatically
+
   plugins = [ pkgs.vimPlugins.tabular ];
   lua = ''
     -- Align
diff --git a/modules/common/neovim/config/bufferline.nix b/modules/common/neovim/config/bufferline.nix
index 73a6514..c52f21f 100644
--- a/modules/common/neovim/config/bufferline.nix
+++ b/modules/common/neovim/config/bufferline.nix
@@ -1,4 +1,7 @@
 { pkgs, ... }: {
+
+  # Shows buffers in a VSCode-style tab layout
+
   plugins = [
     pkgs.vimPlugins.bufferline-nvim
     pkgs.vimPlugins.vim-bbye # Better closing of buffers
diff --git a/modules/common/neovim/config/colors.nix b/modules/common/neovim/config/colors.nix
index 7b72e20..06c29e5 100644
--- a/modules/common/neovim/config/colors.nix
+++ b/modules/common/neovim/config/colors.nix
@@ -1,5 +1,7 @@
 { pkgs, lib, config, ... }: {
 
+  # Sets Neovim colors based on Nix colorscheme
+
   options.colors = lib.mkOption {
     type = lib.types.attrsOf lib.types.str;
     description = "Attrset of base16 colorscheme key value pairs.";
diff --git a/modules/common/neovim/config/completion.nix b/modules/common/neovim/config/completion.nix
index 37fc25f..a982437 100644
--- a/modules/common/neovim/config/completion.nix
+++ b/modules/common/neovim/config/completion.nix
@@ -24,12 +24,14 @@
       end
     '';
 
+    # Enable Luasnip snippet completion
     snippet.expand = dsl.rawLua ''
       function(args)
           require("luasnip").lsp_expand(args.body)
       end
     '';
 
+    # Basic completion keybinds
     mapping = {
       "['<C-n>']" = dsl.rawLua
         "require('cmp').mapping.select_next_item({ behavior = require('cmp').SelectBehavior.Insert })";
@@ -64,24 +66,26 @@
       '';
     };
 
+    # These are where the completion engine gets its suggestions
     sources = [
-      { name = "nvim_lua"; }
-      { name = "nvim_lsp"; }
-      { name = "luasnip"; }
-      { name = "path"; }
+      { name = "nvim_lua"; } # Fills in common Neovim lua functions
+      { name = "nvim_lsp"; } # LSP results
+      { name = "luasnip"; } # Snippets
+      { name = "path"; } # Shell completion from current PATH
       {
-        name = "buffer";
+        name = "buffer"; # Grep for text from the current text buffer
         keyword_length = 3;
         max_item_count = 10;
       }
       {
-        name = "rg";
+        name = "rg"; # Grep for text from the current directory
         keyword_length = 6;
         max_item_count = 10;
         option = { additional_arguments = "--ignore-case"; };
       }
     ];
 
+    # Styling of the completion menu
     formatting = {
       fields = [ "kind" "abbr" "menu" ];
       format = dsl.rawLua ''
diff --git a/modules/common/shell/utilities.nix b/modules/common/shell/utilities.nix
index ea5e015..d11f06d 100644
--- a/modules/common/shell/utilities.nix
+++ b/modules/common/shell/utilities.nix
@@ -35,6 +35,9 @@ in {
         tree # View directory hierarchy
         vimv-rs # Batch rename files
         unzip # Extract zips
+        dua # File sizes (du)
+        du-dust # Disk usage tree (ncdu)
+        duf # Basic disk information (df)
       ];
 
       programs.zoxide.enable = true; # Shortcut jump command