diff --git a/tools/install.sh b/tools/install.sh
index c9e68fe..9e20984 100755
--- a/tools/install.sh
+++ b/tools/install.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
-declare -A install_commands
-install_commands=(\
+declare -A INSTALL_COMMANDS
+INSTALL_COMMANDS=(\
     [git]="apt update && apt install git" \
     [fzf]="git clone --depth 1 https://gitee.com/dictxiong/fzf.git ~/.fzf &&  ~/.fzf/install" \
     [acme.sh]="curl https://get.acme.sh | sh -s email=${EMAIL:-me@beardic.cn}" \
@@ -15,7 +15,7 @@ install_commands=(\
 
 install()
 {
-    echo -e ${install_commands[$1]}
+    echo -e ${INSTALL_COMMANDS[$1]}
 }
 
 install $1
diff --git a/tools/msys2.sh b/tools/msys2.sh
index 3d41d1c..a857c89 100755
--- a/tools/msys2.sh
+++ b/tools/msys2.sh
@@ -19,7 +19,7 @@ pacman_S()
 router()
 {
     case $1 in
-        pacman-S ) pacman_S ;;
+        pacman-S    ) pacman_S ;;
         set-mirror  ) set_mirror $2 ;;  
         *           ) echo unknown command "$1". available: pacman-S, set-mirror ;;
     esac
diff --git a/tools/test.zsh b/tools/test.zsh
index 05a79e7..e3a43af 100644
--- a/tools/test.zsh
+++ b/tools/test.zsh
@@ -1,4 +1,4 @@
-#!/bin/false "This script should be sourced in a shell, not executed directly"
+#!/bin/false "This script should be sourced in zsh, not executed directly"
 
 set -ex