diff --git a/README.md b/README.md
index 9e83934..a6d9cc6 100644
--- a/README.md
+++ b/README.md
@@ -103,21 +103,6 @@ Install a systemd service as user, can be useful for timers for example :
 service_install "services/myservice.service" 1
 ```
 
-### define_env
-
-Define an evirnment variable into the file `~/.config/environment`, you have to
-source this file on your `.bashrc` or your `.zprofile`.
-
- - **input*** :
-     - `$1` : name of the variable
-     - `$2` : value, `""` if empty
- - **output** : no value, but exit the function if the variale is already
-     defined (install) or not in file (uninstall)
-
-```
-define_env "NOTMUCH_CONFIG" "~/.config/notmuch"
-```
-
 ### Avaible variables
 
  - `$repository` : the root folder of the repository
diff --git a/examples/mail_bootstap b/examples/mail_bootstap
index 7841cc6..cde4f3d 100644
--- a/examples/mail_bootstap
+++ b/examples/mail_bootstap
@@ -1,4 +1,4 @@
-# This is an example of a bootstrap file for mail dotfile
+# this is an example of a bootstrap file for mail dotfile
 # here is the strucure of files :
 #
 #   .
@@ -37,6 +37,3 @@ install_service "services/mail.timer" 1
 
 # Symblink an executable to $HOME\.local\bin\
 install_bin "bin/check_mails.sh"
-
-# Define the environment variable for Notmuch
-define_env "NOTMUCH_CONFIG" "~/.config/notmuch"
diff --git a/src/dotinstall.sh b/src/dotinstall.sh
index 5126c4e..91f8c36 100755
--- a/src/dotinstall.sh
+++ b/src/dotinstall.sh
@@ -6,7 +6,7 @@ BIN_DIRECTORY="${HOME}/.local/bin/"
 LIB_DIRECTORY="${HOME}/.local/lib/"
 SYD_DIRECTORY="${HOME}/.config/systemd/user"
 DOTREPO="${HOME}/.config/dotrepo/"
-ENV_FILE="${HOME}/.config/environment"
+
 
 # DEFAULT VALUES
 OVERWRITE_DIRECTORY=0
@@ -281,32 +281,6 @@ install_bin ()
     fi
 }
 
-define_env ()
-{
-    # Put a couple name value into $ENV_FILE file or remove it
-    # on uninstall mode
-    # $1 variable name
-    # $2 value
-
-    [ -z $1 ] && { error "You must define a name"; return; }
-    [ ! -f $ENV_FILE ] && touch $ENV_FILE
-    if [ $install -eq 1 ]
-    then
-        printf "\nCreate an environment variable %s : " "$1"
-        [ $(grep -c -m 1 $1 $ENV_FILE) -eq 1 ] && { error "already exist"; return; }
-        local line
-        line="export ${1}=\"${2}\""
-        echo "$line" >> $ENV_FILE
-        printf "\e[32mdone\e[0m\n"
-    else
-        printf "\nRemove an environment variable %s : " "$1"
-        [ $(grep -c -m 1 $1 $ENV_FILE) -eq 0 ] && { error "not exist"; return; }
-        sed -i "/^export $1=*/d" $ENV_FILE
-        printf "\e[32mdone\e[0m\n"
-
-    fi
-}
-
 ## create bin directory
 [ ! -d $BIN_DIRECTORY ] && mkdir -p $BIN_DIRECTORY || printf "bin exist\n"