diff --git a/hello-wall.ifcx b/hello-wall.ifcx
index 2f1c205..961a993 100644
--- a/hello-wall.ifcx
+++ b/hello-wall.ifcx
@@ -4,7 +4,7 @@
     "ifcxVersion": "ifcx_alpha",
     "dataVersion": "1.0.0",
     "author": "technical@buildingsmart.org",
-    "timestamp": "time string"
+    "timestamp": "time string !"
   },
   "imports": [
     { "uri": "https://ifcx.dev/@standards.buildingsmart.org/ifc/core/ifc@v5a.ifcx" },
@@ -2190,4 +2190,4 @@
       }
     }
   ]
-}
\ No newline at end of file
+}