diff --git a/README.md b/README.md
index fa59f452d6f92de6357a60ffa7c773099e11aae3..fb8ed94879c827ac35025c6153e68291d142adb0 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,8 @@ Once it's done, you will need to create the variable bellow :
 - **TF_VAR_SCW_PROJECT_ID** : Project ID from your Scaleway project.  
 - **TF_VAR_SCW_SECRET_KEY** : Scaleway Secret Key.  
 - **TF_VAR_USER_PASSWORD** : User password for accessing services and instances.  
+- **TF_VAR_INSTANCE_TYPE** : A type of instance to deploy. (DEV-S...)
+- **TF_VAR_VOLUME_DISK** : A number of GB for the volume attached to the instance.
 
 ## Step 3 : Every is set up, deployment is coming !
 
diff --git a/terraform/main.tf b/terraform/main.tf
index b0b6e8974e5b578687dd1ee8cb50142e133f5a47..3d82fbd3f4211e4405abbfcdccedfd182e521308 100644
--- a/terraform/main.tf
+++ b/terraform/main.tf
@@ -75,7 +75,7 @@ resource "scaleway_instance_server" "user_instance_server" {
 
   root_volume {
     volume_type = "b_ssd"
-    size_in_gb = var.INSTANCE_VOLUME_GB
+    size_in_gb = var.INSTANCE_VOLUME_DISK
   }
 
   depends_on = [
diff --git a/terraform/variables-gitlab.tf b/terraform/variables-gitlab.tf
index c7effd2b28a7ff3b97890971bae599556f6a8541..7409479f29679fa5a7da31c79df5ba6e285c94f3 100644
--- a/terraform/variables-gitlab.tf
+++ b/terraform/variables-gitlab.tf
@@ -46,7 +46,7 @@ variable "INSTANCE_TYPE" {
   description = "Type of instance to create"
 }
 
-variable "INSTANCE_VOLUME_GB" {
+variable "INSTANCE_VOLUME_DISK" {
   type        = number
   description = "Number of b_ssd GB storage to attach to the instance"
 }
diff --git a/vars-deployment.json b/vars-deployment.json
index f32aaae00d2b7f7f0b948a2bbbf91298b179773d..0be4fd374964d208efeaf0c92a314253dcfd17f7 100644
--- a/vars-deployment.json
+++ b/vars-deployment.json
@@ -3,6 +3,7 @@
     {
       "name": "ENVIRONMENT",
       "input_name": "Nom unique de l'environnement et du sous-domaine",
+      "input_type": "string",
       "description": "Nom de l'environnement et du sous-domaine, identifiant unique au projet.",
       "masked": false,
       "validation_regex_explanation": "Une chaîne de caractère de 3 à 10 lettres, sans majuscules.",
@@ -11,14 +12,25 @@
     {
       "name": "TF_VAR_INSTANCE_COUNT",
       "input_name": "Nombre d'instances",
+      "input_type": "number",
       "description": "Nombre d'instance a créer.",
       "masked": false,
       "validation_regex_explanation": "Doit contenir une valeur entre 1 et 99.",
       "validation_regex": "^\\d{1,2}$"
     },
+    {
+      "name": "TF_VAR_INSTANCE_VOLUME_DISK",
+      "input_name": "Taille du volume",
+      "input_type": "number",
+      "description": "Taille du disk attaché à l'instance.",
+      "masked": false,
+      "validation_regex_explanation": "Doit contenir une valeur entre 10 et 999.",
+      "validation_regex": "^\\d{2,3}$"
+    },
     {
       "name": "TF_VAR_INSTANCE_TYPE",
-      "input_name": "Instance type",
+      "input_name": "Type d'instance",
+      "input_type": "string-selection",
       "description": "Type d'instance à créer.",
       "masked": false,
       "values": [