diff --git a/test.lua b/test.lua
index 57ec046..d0fa402 100644
--- a/test.lua
+++ b/test.lua
@@ -15,10 +15,12 @@ local function random_choose(t)
 end
 
 local function delete_handler(member)
-	print("delete", member)
+    print("delete", member)
 end
 
-local zs = zset.new(delete_handler)
+local zs = zset.new {
+    delete_handler = delete_handler,
+}
 
 while true do
     local score = random_choose(all)
diff --git a/zset.lua b/zset.lua
index 40cbd09..1844980 100644
--- a/zset.lua
+++ b/zset.lua
@@ -110,17 +110,26 @@ function mt:dump()
 end
 
 local M = {}
-function M.new(delete_handler)
+
+---@class zset.options
+---@field delete_handler fun(member:string)
+
+--- Create a new zset
+---@param options zset.options
+function M.new(options)
     local obj = {}
     obj.sl = skiplist()
     obj.tbl = {}
+
+    local delete_handler = options and options.delete_handler
     obj.delete_function = function(member)
         obj.tbl[member] = nil
         if delete_handler then
             delete_handler(member)
         end
     end
+
     return setmetatable(obj, mt)
 end
-return M
 
+return M