diff --git a/README.md b/README.md
index 8d4a0a6..96e14d8 100644
--- a/README.md
+++ b/README.md
@@ -12,21 +12,43 @@ Shell Client
 ### Possible usages:
 
 ```
-send-notification.sh "All your base are belong to us"
+send-notification.sh [options] "All your base are belong to us"
 ```
 
 ```
-    uptime | send-notification.sh
+uptime | send-notification.sh [options]
 ```
 
+See `send-notification.sh -h`.
+
 ### Configuration :
 
-Edit `send-notification.sh` and set the following variables:
+Script can be configured using the following variables:
+
+* `USER_LOGIN`: The login to use the API.
+* `API_KEY`: The secret key associated to `USER_LOGIN`.
+* `MESSAGE_HEADER` (Optional): Will be prepended to all the messages.
+* `MESSAGE_FOOTER` (Optional): Will be appended to all the messages.
+* `NEWLINE_CHAR` (Optional): Char to use to create a new line (it depends on
+  receiving terminal).
+
+Theses can be directly changed in the `send-notification.sh` file or set in a 
+separate configuration file named `.freemobile-smsapi` next to the script or in
+the user's home directory. A given filepath can also be specify using the `-c`
+script at runtime (`send-notification.sh -c foobar`).
+
+Configuration load process is as follows:
+
+# Uses what's in `send-notification.sh` file.
+# If `-c` option is set, test given file existence and uses what's inside.
+  Will not load any other configuration file (stops load process here).
+# Checks if a `.freemobile-smsapi` file exists next to the script and uses
+  what's inside. Will not load any other configuration file (stops load process
+  here).
+# Checks if a `.freemobile-smsapi` file exists in user's home directory
+  (`${HOME}`) and uses what's inside. Will not load any other configuration file
+  (stops load process here).
 
-* `USER_LOGIN`
-* `API_KEY`
-* `MESSAGE_HEADER` (Optional)
-* `MESSAGE_FOOTER` (Optional)
 
 PHP Client
 ----------
diff --git a/send-notification.sh b/send-notification.sh
index f22de58..d4ef30c 100644
--- a/send-notification.sh
+++ b/send-notification.sh
@@ -8,10 +8,37 @@
 #
 # Nécessite: sed, sh et wget
 #
-# Possible usages:
-#   send-notification.sh "All your base are belong to us"
-#   echo "All your base are belong to us" | send-notification.sh
-#   uptime | send-notification.sh
+# Possible usages: see usage_help()
+
+
+readonly PROGNAME=$(basename $0)
+readonly PROGDIR=$(readlink -m $(dirname $0))
+
+usage_error () {
+    echo "ERROR: ${1}" >&2
+    echo ""
+    usage_help
+    exit 1
+}
+
+usage_help () {
+    echo "Possible usages:"
+    echo "* ${PROGNAME} [options] [message]"
+    echo "* echo \"All your base are belong to us\" | ${PROGNAME} [options]"
+    echo ""
+    echo "Options:"
+    echo "* -c file    specify configuration file"
+    echo "* -h         display this help"
+}
+
+CONFIG_FILE=""
+while getopts "c:h" option; do
+    case "$option" in
+        c) CONFIG_FILE=${OPTARG} ;;
+        :) usage_error "Invalid arguments" ;;
+        h) usage_help ; exit 0 ;;
+    esac
+done
 
 
 ##
@@ -51,6 +78,40 @@ MESSAGE_FOOTER="
 Le serveur de la maison"
 
 
+##
+## Fichier de configuration
+##
+
+if [ -n "${CONFIG_FILE}" ]; then
+    if [ -e "${CONFIG_FILE}" ]; then
+        . "./${CONFIG_FILE}"
+    else
+        echo "ERROR: Configuration file \"${CONFIG_FILE}\" does not exists." >&2
+        exit 2
+    fi
+else
+    if [ -e "${PROGDIR}/.freemobile-smsapi" ]; then
+        . "${PROGDIR}/.freemobile-smsapi"
+    elif [ -e "${HOME}/.freemobile-smsapi" ]; then
+        . "${HOME}/.freemobile-smsapi"
+    fi
+fi
+
+##
+## Vérifications des paramètres requis
+##
+
+if [ -z "${USER_LOGIN}" ] \
+    || [ -z "${API_KEY}" ] \
+    || [ -z "${SMSAPI_BASEURL}" ] \
+    || [ -z "${SMSAPI_SEND_ACTION}" ] \
+; then
+    echo "ERROR: Either USER_LOGIN, API_KEY, SMSAPI_BASEURL or " \
+         "SMSAPI_SEND_ACTION is not set" >&2
+    exit 2
+fi
+
+
 ##
 ## Traitement du message
 ##