diff --git a/README.md b/README.md
index fef6f704..8fe193f8 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ fn sum_as_string(a: usize, b: usize) -> PyResult<String> {
     Ok((a + b).to_string())
 }
 
-/// This module is a python moudle implemented in Rust.
+/// This module is a python module implemented in Rust.
 #[pymodinit]
 fn string_sum(py: Python, m: &PyModule) -> PyResult<()> {
     m.add_function(wrap_function!(sum_as_string))?;
@@ -63,7 +63,7 @@ fn string_sum(py: Python, m: &PyModule) -> PyResult<()> {
 }
 ```
 
-On windows and linux, you can build normally with `cargo build --release`. On Mac OS, you need to set additional linker arguments. One option is to compile with `cargo rustc --release -- -C link-arg=-undefined -C link-arg=dynamic_lookup`, the other is to create a `.cargo/config` with the following content:
+On windows and linux, you can build normally with `cargo build --release`. On macOS, you need to set additional linker arguments. One option is to compile with `cargo rustc --release -- -C link-arg=-undefined -C link-arg=dynamic_lookup`, the other is to create a `.cargo/config` with the following content:
 
 ```toml
 [target.x86_64-apple-darwin]
@@ -73,7 +73,7 @@ rustflags = [
 ]
 ```
 
-For developing, you can copy and rename the shared library from the target folder: On mac os, rename `libstring_sum.dylib` to `string_sum.so`, on windows `libstring_sum.dll` to `string_sum.pyd` and on linux `libstring_sum.so` to `libstring_sum.so`. Then open a python shell in the same folder and you'll be able to `import string_sum`.
+For developing, you can copy and rename the shared library from the target folder: On macOS, rename `libstring_sum.dylib` to `string_sum.so`, on windows `libstring_sum.dll` to `string_sum.pyd` and on linux `libstring_sum.so` to `libstring_sum.so`. Then open a python shell in the same folder and you'll be able to `import string_sum`.
 
 To build, test and publish your crate as python module, you can use [pyo3-pack](https://github.com/PyO3/pyo3-pack) or [setuptools-rust](https://github.com/PyO3/setuptools-rust). You can find an example for setuptools-rust in [examples/word-count](examples/word-count), while pyo3-pack should work on your crate without any configuration.