diff --git a/README.md b/README.md
index 1412d96..b431493 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@ dotinstall:
 
 ### functions
 
-#### bin_check
+#### required_commands
 
 This function check if binary file is avaible in the `PATH`.
 
diff --git a/examples/mail_bootstap b/examples/mail_bootstap
index 7841cc6..395d9fe 100644
--- a/examples/mail_bootstap
+++ b/examples/mail_bootstap
@@ -25,7 +25,7 @@
 #       └── mail.timer
 
 # check required executables
-check_bin "neomutt notmuch mbsync afew msmtp"
+required_commands "neomutt notmuch mbsync afew msmtp"
 
 # symblink folder which contains configurations folders to $HOME/.config/ 
 process_dirs config ${HOME}/.config
diff --git a/src/dotinstall.sh b/src/dotinstall
similarity index 94%
rename from src/dotinstall.sh
rename to src/dotinstall
index 9469260..85aaaad 100755
--- a/src/dotinstall.sh
+++ b/src/dotinstall
@@ -181,9 +181,10 @@ process_dirs () {
     # $2: destination directory
 
     local dest="${repository}/$1"
-    printf "\nProcess directory %s\n" "$1"
+    local source="$2"
+    printf "\nProcess directory %s\n" "$source"
 
-    [ ! -d "$dest" ] && { error "  -> source is not a directory $dest"; return; }
+    [ ! -d "$source" ] && { error "  -> source is not a directory"; return; }
     [ ! -d "$dest" ] && { error "  -> destination is not a directory"; return; }
 
     while read d
@@ -263,11 +264,13 @@ install_service ()
 
 }
 
-check_bin ()
+required_commands ()
 {
     # Check if an executable exist
     # $1 executables separated with spaces
 
+    # if uninstall, we don't need to process required commands.
+    [ $install -eq 0 ] && return
     printf "Checking required programs :\n"
     for p in $1
     do
@@ -324,9 +327,10 @@ define_env ()
     fi
 }
 
-## create bin directory
-[ ! -d $BIN_DIRECTORY ] && mkdir -p $BIN_DIRECTORY || printf "bin exist\n"
-[ ! -d $CACHE_DIR ] && mkdir -p $CACHE_DIR || printf "cache exist\n"
+## create bin and cache direcories
+[ ! -d $BIN_DIRECTORY ] && mkdir -p $BIN_DIRECTORY
+[ ! -d $CACHE_DIR ] && mkdir -p $CACHE_DIR
+
 # define mode : install, uninstall or update
 case $1 in
     "uninstall")
@@ -367,7 +371,6 @@ fi
 [ ! -f "$bootstrap_file" ] && die "$bootstrap_file does not exist" 2 1
 
 private:get_bootstrap_path "$bootstrap_file"
-
 cache_file="${CACHE_DIR}/$(echo $repository | tr '/' '_')"
 
 if [ $update -eq 1 ]
@@ -380,7 +383,8 @@ then
             printf "There is no difference between cached copy and the bootstrap file\n";
             exit 0
         else
-            # Uninstall old files
+            # for updating the dotfile repo, we need to uninstall it then 
+            # install it. We need the cached copy for unistall.
             install=0
             source "$cache_file"
             rm "$cache_file"