diff --git a/docs/values.schema.json b/docs/values.schema.json
index da78b24d54..52f078004c 100644
--- a/docs/values.schema.json
+++ b/docs/values.schema.json
@@ -29,6 +29,19 @@
           "$ref": "https://raw.githubusercontent.com/socialgouv/kontinuous/v1/plugins/contrib/charts/app/kontinuous.values.schema.json#"
         }
       },
+      {
+        "if": {
+          "required": ["~chart"],
+          "properties": {
+            "~chart": {
+              "const": "pg"
+            }
+          }
+        },
+        "then": {
+          "$ref": "https://raw.githubusercontent.com/socialgouv/kontinuous/v1/plugins/fabrique/charts/pg/kontinuous.values.schema.json#"
+        }
+      },
       {
         "if": {
           "required": ["~chart"],
diff --git a/plugins/fabrique/charts/pg/kontinuous.values.schema.json b/plugins/fabrique/charts/pg/kontinuous.values.schema.json
new file mode 100644
index 0000000000..f432403ccd
--- /dev/null
+++ b/plugins/fabrique/charts/pg/kontinuous.values.schema.json
@@ -0,0 +1,26 @@
+{
+  "type": "object",
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "required": [],
+  "properties": {
+    "cnpg-cluster": {
+      "$ref": "https://raw.githubusercontent.com/SocialGouv/helm-charts/charts/cnpg-cluster/values.schema.json"
+    },
+    "backup": {
+      "type": "object",
+      "required": [],
+      "properties": {
+        "enabled": {
+          "type": "boolean",
+          "description": "Enable database backups. \\n\\nEnabled by default on preprod and prod environments",
+          "default": "false"
+        },
+        "name": {
+          "type": "string",
+          "description": "to override the backup destination path (in case we need a new destination for a new cluster)",
+          "default": ""
+        }
+      }
+    }
+  }
+}