diff --git a/src/rpc.zig b/src/rpc.zig
index 704131e..935f1c9 100644
--- a/src/rpc.zig
+++ b/src/rpc.zig
@@ -71,7 +71,7 @@ pub fn RpcClientType(
         const MethodHashMap = std.StringHashMap(Method);
 
         pub const TransType: type = switch (client_tag) {
-            .pipe, .stdio => std.fs.File,
+            .pipe => std.fs.File,
             .socket => std.net.Stream,
         };
 
diff --git a/src/tools.zig b/src/tools.zig
index 093527c..0f5c10a 100644
--- a/src/tools.zig
+++ b/src/tools.zig
@@ -8,8 +8,6 @@ const named_pipe = @import("named_pipe.zig");
 
 /// client type
 pub const ClientType = enum {
-    /// for stdio on unix-*
-    stdio,
     // for windows
     pipe,
     /// for all playform
@@ -70,7 +68,7 @@ const listenErrors = error{
 // listenPipe for windows
 pub fn listen(comptime client_tag: ClientType, pl: anytype) !bool {
     const trans = switch (client_tag) {
-        .pipe, .stdio => @as(std.fs.File, pl),
+        .pipe => @as(std.fs.File, pl),
         .socket => @as(std.net.Stream, pl),
     };
     switch (comptime builtin.target.os.tag) {
diff --git a/src/znvim.zig b/src/znvim.zig
index 3105749..b337df7 100644
--- a/src/znvim.zig
+++ b/src/znvim.zig
@@ -56,10 +56,6 @@ pub fn Client(
     comptime user_data: type,
     comptime delay_time: u64,
 ) type {
-    if (builtin.os.tag == .windows and client_tag == .stdio) {
-        @compileError("for windows, we only can use .pipe or .socket!");
-    }
-
     return struct {
         /// znvim type self
         const Self = @This();
diff --git a/test/test.zig b/test/test.zig
index 28cabd2..d85142f 100644
--- a/test/test.zig
+++ b/test/test.zig
@@ -2,6 +2,10 @@ const std = @import("std");
 const znvim = @import("znvim");
 
 test "basic embed connect" {
+    // create a client type
+    // .socket is just for unix-socket and socket (tcp)
+    // others use .pipe
+    // u32 is the user data type, recommend to use pointer type
     const ClientType = znvim.defaultClient(.pipe, u32);
 
     const args = [_][]const u8{ "nvim", "--embed", "--headless", "-u", "NONE" };
@@ -9,16 +13,23 @@ test "basic embed connect" {
     var nvim = try create_nvim_process(std.testing.allocator, &args, true);
     defer _ = nvim.kill() catch unreachable;
 
+    // init the client
     var client = try ClientType.init(
         nvim.stdin.?,
         nvim.stdout.?,
         std.testing.allocator,
     );
 
+    // do not forget deinit client
     defer client.deinit();
+    // texit client
     defer client.exit();
 
+    // run client event loop
     try client.loop();
+    // get neovim api infos
+    // when you call this function
+    // this will enable api check on debug mode
     try client.getApiInfo();
 }
 
@@ -42,9 +53,14 @@ test "call function" {
     try client.loop();
     try client.getApiInfo();
 
+    // make a params
+    // we no need to free params manually
+    // znvim will do this automatically
     const params = try client.paramArr(0);
 
+    // call api, and current thread will be blocked utill response comes
     const res = try client.call("nvim_get_current_buf", params);
+    // note: we must free result manually
     defer client.freeResultType(res);
 
     try std.testing.expect(res.result.ext.data[0] == 1);
@@ -70,19 +86,27 @@ test "notify function" {
     try client.loop();
     try client.getApiInfo();
 
+    // make a params
+    // this is a 4 length array, in lua this is a list or array
+    // we no need to free params manually
+    // znvim will do this automatically
     var params = try client.paramArr(3);
 
+    // arrary zero element
     const param_0 = try client.paramStr("hello, world!");
 
+    // array first element
     const param_1 = client.paramUint(1);
 
+    // array second element
     const param_2 = try client.paramArr(0);
 
+    // set element
     try params.setArrElement(0, param_0);
     try params.setArrElement(1, param_1);
     try params.setArrElement(2, param_2);
 
-    // try params
+    // notify will not block current thread, it will return immediately
     _ = try client.notify("nvim_notify", params);
 }
 
@@ -101,6 +125,7 @@ test "socket connect test" {
     defer _ = nvim.kill() catch unreachable;
 
     const stream: std.net.Stream = while (true) {
+        // for unix-socket, we can use `std.net.connectUnixSocket`
         const res = std.net.tcpConnectToHost(std.testing.allocator, address, port) catch {
             continue;
         };