diff --git a/README.md b/README.md
index 3f8b7ec..88dd364 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,13 @@
 ![](_logo/syslogzig-removebg.png)
 
-# Zig syslog client
+# <center>Zig syslog client</center>
+
+<center>
 
 [![CI](https://github.com/g41797/syslog/actions/workflows/ci.yml/badge.svg)](https://github.com/g41797/syslog/actions/workflows/ci.yml)[![Wiki](https://img.shields.io/badge/Wikipedia-%23000000.svg?style=for-the-badge&logo=wikipedia&logoColor=white)](https://en.wikipedia.org/wiki/Syslog)
 
+</center>
+
 
   This is a [syslog](https://en.wikipedia.org/wiki/Syslog) client library for Zig:
 
@@ -130,7 +134,76 @@ Import *syslog*:
 const syslog = @import("syslog");
 ```
 
+## Usage
+
+### Configuration
+
+syslog uses following configuration:
+```zig
+pub const SyslogOpts = struct {
+    // application:
+    name: []const u8 = "zigprocess",
+    fcl: rfc5424.Facility = .local7,
+
+    // transport:
+    proto: Protocol = .udp,
+    addr: []const u8 = "127.0.0.1",
+    port: u16 = 514,
+};
+```
+
+### Initialization
+
+```zig
+    var logger: syslog.Syslog = .{};
+    try logger.init(std.testing.allocator, .{
+        .name = "runner",
+        .fcl = .daemon
+        .port = 12345,
+    });
+    defer logger.deinit();
+```
+
+After initialization you can call syslog on different threads.
+
+### Logging  
+There are two groups of APIs:
+- write: message is straight text 
+```zig
+    pub inline fn write_<severity>(slog: *Syslog, msg: []const u8) !void {...}
+    ....
+    logger.write_debug("Hello, Zig!");
+```
+- print: message will be formatted before send
+```zig
+    pub inline fn print_<severity>(slog: *Syslog, comptime fmt: []const u8, msg: anytype) !void {...}
+    ....
+    const name = "World";
+    logger.print_debug("Hello, {s}!", .{name});
+```
+
+### Filtering
+
+Set filter:
+```zig
+    // disable send messages with .info & .debug severities
+    logger.setfilter(.info);// disable send messages with .info & .debug severities 
+```
+
+Reset filter:
+```zig
+    logger.setfilter(null); 
+```
+
+## License
+[MIT](LICENSE)
 
-Powered by  [![clion](_logo/CLion_icon.png)][refclion]
+
+<br />
+<center>
+
+*Powered by*  [![clion](_logo/CLion_icon.png)][refclion]
 
 [refclion]: https://www.jetbrains.com/clion/
+
+</center>
\ No newline at end of file
diff --git a/_notes.txt b/_notes.txt
index bdd908a..2fb2f31 100644
--- a/_notes.txt
+++ b/_notes.txt
@@ -390,5 +390,6 @@ Import
 
     zig fetch --save=network git+https://github.com/ikskuh/zig-network
 
-
+Github MD
+    https://gist.github.com/nikhilnayyar002/7a35e653d3d590e317c829243e73b110
 
diff --git a/src/syslog.zig b/src/syslog.zig
index c9a1228..78d88d8 100644
--- a/src/syslog.zig
+++ b/src/syslog.zig
@@ -33,7 +33,7 @@ pub const Syslog = struct {
     frmtr: Formatter = undefined,
     sndr: Sender = undefined,
     ready: bool = false,
-    filter: Severity = .debug,
+    filter: ?Severity = null,
 
     pub fn init(slog: *Syslog, allocator: Allocator, conf: SyslogOpts) !void {
         slog.mutex.lock();
@@ -121,10 +121,11 @@ pub const Syslog = struct {
             return error.NotReady;
         }
 
-        if (@intFromEnum(svr) > @intFromEnum(slog.filter)) {
-            return;
+        if(slog.filter != null){
+            if (@intFromEnum(svr) >= @intFromEnum(slog.filter.?)) {
+                return;
+            }
         }
-
         _ = try slog.*.sndr.send(try slog.*.frmtr.build(svr, msg));
 
         errdefer slog.ready = false;
@@ -140,8 +141,10 @@ pub const Syslog = struct {
             return error.NotReady;
         }
 
-        if (@intFromEnum(svr) > @intFromEnum(slog.filter)) {
-            return;
+        if(slog.filter != null){
+            if (@intFromEnum(svr) >= @intFromEnum(slog.filter.?)) {
+                return;
+            }
         }
 
         _ = try slog.*.sndr.send(try slog.*.frmtr.format(svr, fmt, msg));
@@ -151,7 +154,7 @@ pub const Syslog = struct {
         return;
     }
 
-    pub fn setfilter(slog: *Syslog, svr: Severity) void {
+    pub fn setfilter(slog: *Syslog, svr: ?Severity) void {
         slog.mutex.lock();
         defer slog.mutex.unlock();
 
diff --git a/src/syslog_tests.zig b/src/syslog_tests.zig
index 0c98e57..88b929b 100644
--- a/src/syslog_tests.zig
+++ b/src/syslog_tests.zig
@@ -170,6 +170,8 @@ fn hellozig() !void {
     });
     defer logger.deinit();
 
+    logger.setfilter(.debug);
+
     // Send syslog message
     try logger.write_info("Hello, Zig!");