diff --git a/README.md b/README.md
index d60673ff..76ac55da 100644
--- a/README.md
+++ b/README.md
@@ -33,13 +33,13 @@ You can download the latest release of `gale` from the [releases page](https://g
 or you can install `gale` using:
 
 ```bash!
-curl https://raw.githubusercontent.com/aweris/gale/main/hack/install_gale.sh | sh
+curl -sfLo install.sh https://raw.githubusercontent.com/aweris/gale/main/hack/install.sh; sh ./install.sh
 ```
 
 The following command will install latest version of `gale` to your current directory. You can also specify following environment variables,
 
-- `VERSION` to specify the version of `gale` to install, e.g. `VERSION=v0.0.1` default is `latest`
-- `INSTALL_DIR` to specify the directory to install `gale` to, e.g. `INSTALL_DIR=/usr/local/bin` default is current directory
+- `GALE_VERSION` to specify the version of `gale` to install, e.g. `GALE_VERSION=v0.0.1` default is `latest`
+- `BIN_DIR` to specify the directory to install `gale` to, e.g. `BIN_DIR=/usr/local/bin` default is current directory
 
 ```bash!
 curl https://raw.githubusercontent.com/aweris/gale/main/hack/install_gale.sh | sudo VERSION=v0.0.1 INSTALL_DIR=/usr/local/bin sh
diff --git a/hack/install_gale.sh b/hack/install.sh
similarity index 69%
rename from hack/install_gale.sh
rename to hack/install.sh
index 0d4db4d1..af107545 100755
--- a/hack/install_gale.sh
+++ b/hack/install.sh
@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 
 RELEASE=$(curl -s "https://api.github.com/repos/aweris/gale/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
-VERSION="${VERSION:-${RELEASE}}"
-INSTALL_DIR="${INSTALL_DIR:-.}"
+GALE_VERSION="${GALE_VERSION:-${RELEASE}}"
+BIN_DIR="${BIN_DIR:-.}"
 
 function install_gale() {
     local version=$1
@@ -13,11 +13,11 @@ function install_gale() {
 
     echo "Downloading ${download_url}"
 
-    curl -sL "${download_url}" | tar xz -C "${INSTALL_DIR}"
+    curl -sL "${download_url}" | tar xz -C "${BIN_DIR}"
 
-    echo "Installed gale ${version} to ${INSTALL_DIR}"
+    echo "Installed gale ${version} to ${BIN_DIR}"
 
-    "${INSTALL_DIR}/gale" version
+    "${BIN_DIR}/gale" version
 
     echo "Done."
 }
@@ -29,12 +29,12 @@ function main() {
     local arch
     arch=$(uname -m | tr '[:upper:]' '[:lower:]')
 
-    if [[ -z "${VERSION}" ]]; then
+    if [[ -z "${GALE_VERSION}" ]]; then
         echo "failed to get latest version from GitHub API"
         exit 1
     fi
 
-    install_gale "${VERSION}" "${os}" "${arch}"
+    install_gale "${GALE_VERSION}" "${os}" "${arch}"
 }
 
 main "$@"
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