diff --git a/lua/paper-tonic-modern/groups/treesitter.lua b/lua/paper-tonic-modern/groups/treesitter.lua
index 1819327..8b2fa64 100644
--- a/lua/paper-tonic-modern/groups/treesitter.lua
+++ b/lua/paper-tonic-modern/groups/treesitter.lua
@@ -292,6 +292,6 @@ return {
   ['@none'] = {},
   ['@conceal'] = { fg = c.fg_weaker },
   
-  ['@spell'] = {},
-  ['@nospell'] = {},
+  -- @spell and @nospell should not define any styling
+  -- This allows vim.wo.spell to control spell highlighting via SpellBad/SpellCap/etc
 }
diff --git a/lua/settings.lua b/lua/settings.lua
index 697dd78..ed06b65 100644
--- a/lua/settings.lua
+++ b/lua/settings.lua
@@ -60,6 +60,9 @@ vim.opt.hlsearch = true -- Highlight all search matches
 vim.opt.iskeyword:append("$")
 vim.opt.iskeyword:append("-")
 
+-- Terminal and color support
+vim.opt.termguicolors = true -- Enable 24-bit RGB color (required for colored underlines)
+
 -- Visuals
 vim.opt.showbreak = "  ↳"
 vim.opt.listchars = {
diff --git a/spell/en.utf-8.add b/spell/en.utf-8.add
index c779ae2..47446ee 100644
--- a/spell/en.utf-8.add
+++ b/spell/en.utf-8.add
@@ -778,3 +778,7 @@ dropdowns
 contenteditable
 #uer/!
 suer/!
+RDV
+param
+int
+bool
diff --git a/spell/en.utf-8.add.spl b/spell/en.utf-8.add.spl
index 5382f71..3890753 100644
Binary files a/spell/en.utf-8.add.spl and b/spell/en.utf-8.add.spl differ