diff --git a/lua/fugitive-ts/highlight.lua b/lua/fugitive-ts/highlight.lua
index 31878b6..8c821fb 100644
--- a/lua/fugitive-ts/highlight.lua
+++ b/lua/fugitive-ts/highlight.lua
@@ -1,8 +1,18 @@
 local M = {}
 
+local debug_enabled = false
+
+---@param enabled boolean
+function M.set_debug(enabled)
+  debug_enabled = enabled
+end
+
 ---@param msg string
 ---@param ... any
 local function dbg(msg, ...)
+  if not debug_enabled then
+    return
+  end
   local formatted = string.format(msg, ...)
   vim.notify('[fugitive-ts] ' .. formatted, vim.log.levels.DEBUG)
 end
@@ -13,9 +23,8 @@ end
 ---@param col_offset integer
 ---@param text string
 ---@param lang string
----@param debug? boolean
 ---@return integer
-local function highlight_text(bufnr, ns, hunk, col_offset, text, lang, debug)
+local function highlight_text(bufnr, ns, hunk, col_offset, text, lang)
   local ok, parser_obj = pcall(vim.treesitter.get_string_parser, text, lang)
   if not ok or not parser_obj then
     return 0
@@ -59,7 +68,6 @@ end
 ---@field max_lines integer
 ---@field conceal_prefixes boolean
 ---@field highlights fugitive-ts.Highlights
----@field debug boolean
 
 ---@param bufnr integer
 ---@param ns integer
@@ -72,15 +80,13 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
   end
 
   if #hunk.lines > opts.max_lines then
-    if opts.debug then
-      dbg(
-        'skipping hunk %s:%d (%d lines > %d max)',
-        hunk.filename,
-        hunk.start_line,
-        #hunk.lines,
-        opts.max_lines
-      )
-    end
+    dbg(
+      'skipping hunk %s:%d (%d lines > %d max)',
+      hunk.filename,
+      hunk.start_line,
+      #hunk.lines,
+      opts.max_lines
+    )
     return
   end
 
@@ -97,25 +103,19 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
 
   local ok, parser_obj = pcall(vim.treesitter.get_string_parser, code, lang)
   if not ok or not parser_obj then
-    if opts.debug then
-      dbg('failed to create parser for lang: %s', lang)
-    end
+    dbg('failed to create parser for lang: %s', lang)
     return
   end
 
   local trees = parser_obj:parse()
   if not trees or #trees == 0 then
-    if opts.debug then
-      dbg('parse returned no trees for lang: %s', lang)
-    end
+    dbg('parse returned no trees for lang: %s', lang)
     return
   end
 
   local query = vim.treesitter.query.get(lang, 'highlights')
   if not query then
-    if opts.debug then
-      dbg('no highlights query for lang: %s', lang)
-    end
+    dbg('no highlights query for lang: %s', lang)
     return
   end
 
@@ -126,16 +126,9 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
       hl_group = 'Normal',
       priority = 199,
     })
-    local header_extmarks = highlight_text(
-      bufnr,
-      ns,
-      hunk,
-      hunk.header_context_col,
-      hunk.header_context,
-      lang,
-      opts.debug
-    )
-    if opts.debug and header_extmarks > 0 then
+    local header_extmarks =
+      highlight_text(bufnr, ns, hunk, hunk.header_context_col, hunk.header_context, lang)
+    if header_extmarks > 0 then
       dbg('header %s:%d applied %d extmarks', hunk.filename, hunk.start_line, header_extmarks)
     end
   end
@@ -196,9 +189,7 @@ function M.highlight_hunk(bufnr, ns, hunk, opts)
     extmark_count = extmark_count + 1
   end
 
-  if opts.debug then
-    dbg('hunk %s:%d applied %d extmarks', hunk.filename, hunk.start_line, extmark_count)
-  end
+  dbg('hunk %s:%d applied %d extmarks', hunk.filename, hunk.start_line, extmark_count)
 end
 
 return M
diff --git a/lua/fugitive-ts/init.lua b/lua/fugitive-ts/init.lua
index b659342..1e19c03 100644
--- a/lua/fugitive-ts/init.lua
+++ b/lua/fugitive-ts/init.lua
@@ -72,15 +72,13 @@ local function highlight_buffer(bufnr)
 
   vim.api.nvim_buf_clear_namespace(bufnr, ns, 0, -1)
 
-  local hunks =
-    parser.parse_buffer(bufnr, config.languages, config.disabled_languages, config.debug)
+  local hunks = parser.parse_buffer(bufnr, config.languages, config.disabled_languages)
   dbg('found %d hunks in buffer %d', #hunks, bufnr)
   for _, hunk in ipairs(hunks) do
     highlight.highlight_hunk(bufnr, ns, hunk, {
       max_lines = config.max_lines_per_hunk,
       conceal_prefixes = config.conceal_prefixes,
       highlights = config.highlights,
-      debug = config.debug,
     })
   end
 end
@@ -160,7 +158,31 @@ end
 ---@param opts? fugitive-ts.Config
 function M.setup(opts)
   opts = opts or {}
+
+  vim.validate({
+    enabled = { opts.enabled, 'boolean', true },
+    debug = { opts.debug, 'boolean', true },
+    languages = { opts.languages, 'table', true },
+    disabled_languages = { opts.disabled_languages, 'table', true },
+    debounce_ms = { opts.debounce_ms, 'number', true },
+    max_lines_per_hunk = { opts.max_lines_per_hunk, 'number', true },
+    conceal_prefixes = { opts.conceal_prefixes, 'boolean', true },
+    highlights = { opts.highlights, 'table', true },
+  })
+
+  if opts.highlights then
+    vim.validate({
+      ['highlights.treesitter'] = { opts.highlights.treesitter, 'boolean', true },
+      ['highlights.headers'] = { opts.highlights.headers, 'boolean', true },
+      ['highlights.background'] = { opts.highlights.background, 'boolean', true },
+      ['highlights.linenr'] = { opts.highlights.linenr, 'boolean', true },
+      ['highlights.vim'] = { opts.highlights.vim, 'boolean', true },
+    })
+  end
+
   config = vim.tbl_deep_extend('force', default_config, opts)
+  parser.set_debug(config.debug)
+  highlight.set_debug(config.debug)
 end
 
 return M
diff --git a/lua/fugitive-ts/parser.lua b/lua/fugitive-ts/parser.lua
index 8cd119b..fa0bd16 100644
--- a/lua/fugitive-ts/parser.lua
+++ b/lua/fugitive-ts/parser.lua
@@ -8,9 +8,19 @@
 
 local M = {}
 
+local debug_enabled = false
+
+---@param enabled boolean
+function M.set_debug(enabled)
+  debug_enabled = enabled
+end
+
 ---@param msg string
 ---@param ... any
 local function dbg(msg, ...)
+  if not debug_enabled then
+    return
+  end
   local formatted = string.format(msg, ...)
   vim.notify('[fugitive-ts] ' .. formatted, vim.log.levels.DEBUG)
 end
@@ -18,15 +28,12 @@ end
 ---@param filename string
 ---@param custom_langs? table<string, string>
 ---@param disabled_langs? string[]
----@param debug? boolean
 ---@return string?
-local function get_lang_from_filename(filename, custom_langs, disabled_langs, debug)
+local function get_lang_from_filename(filename, custom_langs, disabled_langs)
   if custom_langs and custom_langs[filename] then
     local lang = custom_langs[filename]
     if disabled_langs and vim.tbl_contains(disabled_langs, lang) then
-      if debug then
-        dbg('lang disabled: %s', lang)
-      end
+      dbg('lang disabled: %s', lang)
       return nil
     end
     return lang
@@ -34,28 +41,22 @@ local function get_lang_from_filename(filename, custom_langs, disabled_langs, de
 
   local ft = vim.filetype.match({ filename = filename })
   if not ft then
-    if debug then
-      dbg('no filetype for: %s', filename)
-    end
+    dbg('no filetype for: %s', filename)
     return nil
   end
 
   local lang = vim.treesitter.language.get_lang(ft)
   if lang then
     if disabled_langs and vim.tbl_contains(disabled_langs, lang) then
-      if debug then
-        dbg('lang disabled: %s', lang)
-      end
+      dbg('lang disabled: %s', lang)
       return nil
     end
     local ok = pcall(vim.treesitter.language.inspect, lang)
     if ok then
       return lang
     end
-    if debug then
-      dbg('no parser for lang: %s (ft: %s)', lang, ft)
-    end
-  elseif debug then
+    dbg('no parser for lang: %s (ft: %s)', lang, ft)
+  else
     dbg('no ts lang for filetype: %s', ft)
   end
 
@@ -65,9 +66,8 @@ end
 ---@param bufnr integer
 ---@param custom_langs? table<string, string>
 ---@param disabled_langs? string[]
----@param debug? boolean
 ---@return fugitive-ts.Hunk[]
-function M.parse_buffer(bufnr, custom_langs, disabled_langs, debug)
+function M.parse_buffer(bufnr, custom_langs, disabled_langs)
   local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
   ---@type fugitive-ts.Hunk[]
   local hunks = {}
@@ -107,8 +107,8 @@ function M.parse_buffer(bufnr, custom_langs, disabled_langs, debug)
     if filename then
       flush_hunk()
       current_filename = filename
-      current_lang = get_lang_from_filename(filename, custom_langs, disabled_langs, debug)
-      if debug and current_lang then
+      current_lang = get_lang_from_filename(filename, custom_langs, disabled_langs)
+      if current_lang then
         dbg('file: %s -> lang: %s', filename, current_lang)
       end
     elseif line:match('^@@.-@@') then
diff --git a/spec/highlight_spec.lua b/spec/highlight_spec.lua
index 3f800f7..38743f6 100644
--- a/spec/highlight_spec.lua
+++ b/spec/highlight_spec.lua
@@ -36,7 +36,6 @@ describe('highlight', function()
           linenr = false,
           vim = false,
         },
-        debug = false,
       }
       if overrides then
         for k, v in pairs(overrides) do