diff --git a/libs/simple-slider.lua b/libs/simple-slider.lua
index d234d99..e5a8b3b 100644
--- a/libs/simple-slider.lua
+++ b/libs/simple-slider.lua
@@ -26,6 +26,21 @@ OTHER DEALINGS IN THE SOFTWARE.
 local slider = {}
 slider.__index = slider
 
+---@type table
+---@class slider.style
+---@field width? number
+---@field orientatio? 'horizontal'|'vertical'
+---@field track? 'rectangle'|'line'|'roundrect'
+---@field knob? 'rectangle'|'circle'
+
+---@param x number
+---@param y number
+---@param length number
+---@param value number
+---@param min number
+---@param max number
+---@param setter? function
+---@param style? slider.style
 function newSlider(x, y, length, value, min, max, setter, style)
     local s = {}
     s.value = (value - min) / (max - min)