diff --git a/Makefile b/Makefile
index 07b7be8..d7daf8b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,9 @@
-BIN    := $(HOME)/.local/bin
-DIST   := $(CURDIR)/dist
-NAME   := thu-learn-downloader
+BIN  := $(HOME)/.local/bin
+DIST := $(CURDIR)/dist
+NAME := thu-learn-downloader
 
-OS   != echo $(RUNNER_OS)   | tr '[:upper:]' '[:lower:]'
-ARCH != echo $(RUNNER_ARCH) | tr '[:upper:]' '[:lower:]'
+OS   := $(shell echo $(RUNNER_OS)   | tr '[:upper:]' '[:lower:]')
+ARCH := $(shell echo $(RUNNER_ARCH) | tr '[:upper:]' '[:lower:]')
 ifeq ($(OS), windows)
 	EXE := .exe
 else
diff --git a/README.md b/README.md
index b5ab7ac..44bc839 100644
--- a/README.md
+++ b/README.md
@@ -33,15 +33,7 @@
 
 ## Usage
 
-### Pre-built Binary
+Download pre-built binary from [releases](https://github.com/liblaf/thu-learn-downloader/releases) or install from PyPI by executing `pip install thu-learn-downloader`.
 
-1. Download pre-built binary from [releases](https://github.com/liblaf/thu-learn-downloader/releases).
-2. Prepare a `config.yaml` like [config.yaml](https://github.com/liblaf/thu-learn-downloader/blob/main/config.yaml).
-3. Run `thu-learn-downloader password="***"` and wait for the sync to finish.
-
-### pip
-
-```shell
-pip install thu-learn-downloader
-python -m thu_learn_downloader username="***" password="***"
-```
+1. Prepare a `config.yaml` like [config.yaml](https://github.com/liblaf/thu-learn-downloader/blob/main/config.yaml).
+2. Run `thu-learn-downloader password="***"` and wait for the sync to finish.