diff --git a/Cargo.toml b/Cargo.toml
index e57755b..c733e24 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,6 +2,14 @@
 name = "cpumask"
 version = "0.1.0"
 edition = "2021"
+authors = ["keyang.hu@qq.com"]
+description = "CPU mask library in Rust"
+license = "GPL-3.0-or-later OR Apache-2.0 OR MulanPSL-2.0"
+homepage = "https://github.com/arceos-org/arceos"
+repository = "https://github.com/arceos-org/cpumask"
+documentation = "https://docs.rs/cpumask"
+keywords = ["arceos", "cpu-affinity", "cpumask"]
+categories = ["os", "no-std"]
 
 [dependencies]
-bitmaps = { version = "3.2.1", default-features = false }
\ No newline at end of file
+bitmaps = { version = "3.2.1", default-features = false }
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..13f65c0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,57 @@
+# cpumask
+
+[![Crates.io](https://img.shields.io/crates/v/cpumask)](https://crates.io/crates/cpumask)
+[![Docs.rs](https://docs.rs/cpumask/badge.svg)](https://docs.rs/cpumask)
+[![CI](https://github.com/arceos-org/cpumask/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/arceos-org/cpumask/actions/workflows/ci.yml)
+
+CPU mask library
+
+Cpumasks provide a bitmap suitable for representing the set of CPUs in a system, one bit position per CPU number.
+In general, only nr_cpu_ids (<= NR_CPUS) bits are valid.
+Refering to `cpumask_t` in Linux.
+Reference:
+
+* <https://man7.org/linux/man-pages/man2/sched_setaffinity.2.html>    
+* <https://man7.org/linux/man-pages/man3/CPU_SET.3.html>
+* <https://elixir.bootlin.com/linux/v6.11/source/include/linux/cpumask_types.h>
+
+## Examples
+
+```Rust
+use cpumask::CpuMask;
+const SMP: usize = 32;
+
+let mut cpumask = CpuMask::<SMP>::new();
+
+assert!(cpumask.is_empty());
+cpumask.set(0, true);
+
+assert!(!cpumask.is_empty());
+assert!(cpumask.get(0));
+assert_eq!(cpumask.len(), 1);
+
+assert!(!cpumask.set(1, true));
+assert_eq!(cpumask.len(), 2);
+assert_eq!(cpumask.first_false_index(), Some(2));
+
+let mut oneshot = CpuMask::<SMP>::one_shot(SMP - 1);
+assert!(!oneshot.is_empty());
+assert!(oneshot.get(SMP - 1));
+assert_eq!(oneshot.first_index(), Some(SMP - 1));
+assert_eq!(oneshot.len(), 1);
+
+oneshot.set(0, false);
+assert!(!oneshot.is_empty());
+oneshot.set(SMP - 1, false);
+assert!(oneshot.is_empty());
+assert_eq!(oneshot.len(), 0);
+assert_eq!(oneshot.first_index(), None);
+
+let mut cpumask_full = CpuMask::<SMP>::full();
+assert_eq!(cpumask_full.len(), SMP);
+assert_eq!(cpumask_full.first_index(), Some(0));
+assert_eq!(cpumask_full.first_false_index(), None);
+cpumask_full.set(SMP-1, false);
+assert_eq!(cpumask_full.len(), SMP - 1);
+assert_eq!(cpumask_full.first_false_index(), Some(SMP-1));
+```
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index 4ff1b9e..0d6031b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,14 +1,5 @@
-//! CPU mask library
-//! Cpumasks provide a bitmap suitable for representing the set of CPUs in a system,
-//! one bit position per CPU number.
-//! In general, only nr_cpu_ids (<= NR_CPUS) bits are valid.
-//! Refering to `cpumask_t` in Linux.
-//! Reference:
-//!     * <https://man7.org/linux/man-pages/man2/sched_setaffinity.2.html>
-//!     * <https://man7.org/linux/man-pages/man3/CPU_SET.3.html>
-//!     * <https://elixir.bootlin.com/linux/v6.11/source/include/linux/cpumask_types.h>
-
 #![cfg_attr(not(test), no_std)]
+#![doc = include_str!("../README.md")]
 
 use core::hash::{Hash, Hasher};
 use core::ops::*;