diff --git a/README.md b/README.md
index c1868b1..9de42d5 100644
--- a/README.md
+++ b/README.md
@@ -27,8 +27,8 @@ You can install rustus by 4 different ways.
 
 ### From source
 
-To build it from source rust must be installed.
-Preferred version is 1.59.0.
+To build it from source rust must be installed. We don't rely on nightly features,
+you can use last stable release.
 
 ```bash
 git clone https://github.com/s3rius/rustus.git
diff --git a/deploy/Dockerfile b/deploy/Dockerfile
index f0b3314..545994f 100644
--- a/deploy/Dockerfile
+++ b/deploy/Dockerfile
@@ -1,4 +1,4 @@
-FROM rust:1.64.0-bullseye AS builder
+FROM rust:1.66.0-bullseye AS builder
 
 WORKDIR /app
 COPY Cargo.toml Cargo.lock ./
diff --git a/docs/index.md b/docs/index.md
index 93e9e68..4c2c2fa 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -24,13 +24,13 @@ You can install rustus in four different ways.
 
 ### From source
 
-To build it from source rust must be installed.
-Preferred version is 1.59.0.
+To build it from source rust must be installed. We don't rely on nightly features,
+you can use last stable release.
 
 ```bash
 git clone https://github.com/s3rius/rustus.git
 cd rustus
-cargo install --path . --features=all,metrics
+cargo install --path . --features=all
 ```
 
 Also, you can speedup build by disabling some features.
diff --git a/src/storages/s3_hybrid_storage.rs b/src/storages/s3_hybrid_storage.rs
index c33c67e..17a2cf1 100644
--- a/src/storages/s3_hybrid_storage.rs
+++ b/src/storages/s3_hybrid_storage.rs
@@ -90,7 +90,8 @@ impl S3HybridStorage {
 
     /// Upload file to S3.
     ///
-    /// This function is called with
+    /// This function is called to upload file to s3 completely.
+    /// It streams file directly from disk to s3.
     async fn upload_file(&self, file_info: &FileInfo) -> RustusResult<()> {
         if file_info.path.is_none() {
             return Err(RustusError::UnableToWrite("Cannot get upload path.".into()));