diff --git a/core/src/sign/api.rs b/core/src/api.rs
similarity index 100%
rename from core/src/sign/api.rs
rename to core/src/api.rs
diff --git a/core/src/lib.rs b/core/src/lib.rs
index f05698a..c41c9ac 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -1,22 +1,13 @@
 //! Signing API requests without effort.
-//!
-//! # Services
-//!
-//! - [Aliyun OSS][crate::AliyunOssSigner] for Aliyun OSS.
-//! - [AWS SigV4][`reqsign-aws-v4`] for AWS services like S3.
-//! - [Azure Storage][crate::AzureStorageSigner] for Azure Storage services like Azure Blob Service.
-//! - [Google][crate::GoogleSigner] for All google cloud services like Google Cloud Storage Service.
-//! - [Huawei Cloud OBS][crate::HuaweicloudObsSigner] for Huawei Cloud Object Storage Service (OBS).
 
 // Make sure all our public APIs have docs.
 #![warn(missing_docs)]
 
-mod sign;
-pub use sign::*;
-
 pub mod hash;
 pub mod time;
 
+mod context;
+pub use context::Context;
 mod fs;
 pub use fs::FileRead;
 mod http;
@@ -24,5 +15,10 @@ pub use http::HttpSend;
 mod env;
 pub use env::Env;
 pub use env::StaticEnv;
-mod context;
-pub use context::Context;
+
+mod api;
+pub use api::{Build, Key, Load};
+mod request;
+pub use request::{SigningMethod, SigningRequest};
+mod signer;
+pub use signer::Signer;
diff --git a/core/src/sign/request.rs b/core/src/request.rs
similarity index 100%
rename from core/src/sign/request.rs
rename to core/src/request.rs
diff --git a/core/src/sign/mod.rs b/core/src/sign/mod.rs
deleted file mode 100644
index f863576..0000000
--- a/core/src/sign/mod.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-mod api;
-pub use api::Build;
-pub use api::Key;
-pub use api::Load;
-
-mod request;
-pub use request::SigningMethod;
-pub use request::SigningRequest;
-
-mod signer;
-pub use signer::Signer;
diff --git a/core/src/sign/signer.rs b/core/src/signer.rs
similarity index 100%
rename from core/src/sign/signer.rs
rename to core/src/signer.rs