diff --git a/lua/neogen/mark.lua b/lua/neogen/mark.lua
index 3a5f7d2..d3a0046 100644
--- a/lua/neogen/mark.lua
+++ b/lua/neogen/mark.lua
@@ -3,6 +3,8 @@ local mark = {}
 local api = vim.api
 local ns = api.nvim_create_namespace("neogen")
 
+--- Start marks creation and get useful informations
+---@private
 mark.start = function(self)
     if self.started then
         mark:stop()
@@ -17,11 +19,18 @@ mark.start = function(self)
     self.started = true
 end
 
+--- Get a mark specified with i index
+---@param i number
+---@private
 mark.get_mark = function(self, i)
     local id = self.ids[i]
     return api.nvim_buf_get_extmark_by_id(self.bufnr, ns, id, {})
 end
 
+--- Add a mark with position
+---@param pos table Position as line, col
+---@return number the id of the inserted mark
+---@private
 mark.add_mark = function(self, pos)
     local line, col = unpack(pos)
     local id = api.nvim_buf_set_extmark(self.bufnr, ns, line, col, {})
@@ -29,10 +38,17 @@ mark.add_mark = function(self, pos)
     return id
 end
 
+--- Get how many marks are created
+---@return number
+---@private
 mark.mark_len = function(self)
     return #self.ids
 end
 
+--- Verify if the marks can be jumpable
+---@param reverse boolean
+---@return boolean
+---@private
 mark.jumpable = function(self, reverse)
     if not self.started then
         return false
@@ -49,12 +65,15 @@ mark.jumpable = function(self, reverse)
     return ret
 end
 
+--- Jump to next/previous mark if possible
+---@param reverse boolean
+---@private
 mark.jump = function(self, reverse)
     if mark:jumpable(reverse) then
         self.index = reverse and self.index - 1 or self.index + 1
         if self.index > 0 and self.index <= #self.ids then
             local line, row = unpack(self:get_mark(self.index))
-            api.nvim_win_set_cursor(self.winid, {line + 1, row})
+            api.nvim_win_set_cursor(self.winid, { line + 1, row })
         else
             self:stop(true)
         end
@@ -63,6 +82,8 @@ mark.jump = function(self, reverse)
     end
 end
 
+--- Clear marks and stop jumping ability
+---@private
 mark.stop = function(self, should_jump)
     local bufnr = self.bufnr
     if bufnr and bufnr > 0 and api.nvim_buf_is_valid(bufnr) then
@@ -74,7 +95,7 @@ mark.stop = function(self, should_jump)
         if should_jump and winid and winid > 0 and api.nvim_win_is_valid(winid) then
             local pos = api.nvim_buf_get_extmark_by_id(self.bufnr, ns, self.last_jump, {})
             local line, col = unpack(pos)
-            api.nvim_win_set_cursor(winid, {line + 1, col})
+            api.nvim_win_set_cursor(winid, { line + 1, col })
         end
         api.nvim_buf_del_extmark(bufnr, ns, self.last_jump)
     end