diff --git a/validator/schema/upsun.json b/validator/schema/upsun.json
index 012c408..11e536d 100644
--- a/validator/schema/upsun.json
+++ b/validator/schema/upsun.json
@@ -247,11 +247,13 @@
                     "type": "string",
                     "title": "The command used to start the application",
                     "description": "It will be restarted if it terminates. Do not use on PHP unless using a custom persistent process like React PHP or FrankenPHP. \nSee note: \nhttps://docs.upsun.com/anchors/app/reference/web/commands/start/"
+                  },
+                  "post_start": {
+                    "type": "string",
+                    "title": "A command executed after the application is started",
+                    "description": "More information: \nhttps://docs.upsun.com/anchors/app/reference/web/commands/"
                   }
                 },
-                "required": [
-                  "start"
-                ],
                 "additionalProperties": false,
                 "title": "The command to launch your app",
                 "description": "More information: \nhttps://docs.upsun.com/anchors/app/reference/web/commands/"
diff --git a/validator/validator_test.go b/validator/validator_test.go
index 8532be3..b0b7d0c 100644
--- a/validator/validator_test.go
+++ b/validator/validator_test.go
@@ -147,6 +147,10 @@ applications:
           - pdo_sqlite
       - "nodejs@20"
       - "python@3.12"
+    web:
+      commands:
+        pre_start: echo "pre_start"
+        post_start: echo "post_start"
 `,
 						),
 					},