diff --git a/README.md b/README.md
index e88cd8e..eb46d16 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@
 2. [Scripts](#scripts)
     * [Proxmox](#proxmox)
     * [Grav](#grav)
+    * [Sesame2mail](#sesame2mail)
 
 
 ## Overview
@@ -40,3 +41,11 @@ A daily cron to check if [Grav][grav website] got available updates.
 
 
 [grav website]: https://getgrav.org/
+
+### Sesame2mail
+
+Give a user's mail address from it's user ID (sesame).
+
+The first argument can be :
+* A file with a list of user ID (sesame), one per line.
+* A user ID (sesame), only one.
diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..e69de29
diff --git a/sesame2mail b/sesame2mail
index 26ddf21..58c88ce 100755
--- a/sesame2mail
+++ b/sesame2mail
@@ -1,32 +1,38 @@
 #!/bin/sh
 
 # This script will convert UR1 user sesame into UR1 user mail
-# The first argument should be a file with a uid by line!
+# The first argument should be a file with a uid by line !
+#   OR a USER sesame (id).
 
 # Dependancies:
 # ldapsearch (provide by ldap-utils on GNU/Linux)
 
-UID_LIST="${1}"
-MAIL_LIST="${UID_LIST}_mail"
+if [ -f "${1}" ]; then
+
+	UID_LIST="${1}"
+	MAIL_LIST="${UID_LIST}_mail"
+
+	printf '%b' "Convert the list of ID in **${UID_LIST}** to mail\n"
+
+	touch "${MAIL_LIST}"
+
+	index=0
+	while read uid; do
+		index=$((index+1))
+		mail=$(ldapsearch -ZZ -H ldap://ldap.univ-rennes1.fr -LLL '(uid='"${uid}"')' -b "dc=univ-rennes1,dc=fr" -x mail | grep "^mail" | cut -d" " -f2)
+
+		printf '%b' "${mail}\n" >> "${MAIL_LIST}"
+
+	done < "${UID_LIST}"
+
+	printf '%b' "Please see ${MAIL_LIST} file\n"
 
-# Test if the given file exists
-if [ -f "${UID_LIST}" ]; then
-  touch "${MAIL_LIST}"
 else
-  printf '%b' "The fist argument should be a file with one mail/line\n"
-  exit 1
+	USER_ID="${1}"
+
+	printf '%b' "This sesame correspond to :\n"
+	ldapsearch -ZZ -H ldap://ldap.univ-rennes1.fr -LLL '(uid='"${USER_ID}"')' -b "dc=univ-rennes1,dc=fr" -x mail | grep "^mail" | cut -d" " -f2
 fi
 
-index=0
-while read uid; do
-  index=$((index+1))
-  mail=$(ldapsearch -ZZ -H ldap://ldap.univ-rennes1.fr -LLL '(uid='"${uid}"')' -b "dc=univ-rennes1,dc=fr" -x mail | grep "^mail" | cut -d" " -f2)
-
-  #printf '%b' "${index}: ${mail} -> ${uid}\n"
-  printf '%b' "${mail}\n" >> "${MAIL_LIST}"
-
-done < "${UID_LIST}"
-
-printf '%b' "Please see ${MAIL_LIST} file\n"
 
 exit 0