diff --git a/repository/STON-Core.package/NotFound.extension/class/signalFor..st b/repository/STON-Core.package/NotFound.extension/class/signalFor..st
new file mode 100644
index 0000000..2ff5e25
--- /dev/null
+++ b/repository/STON-Core.package/NotFound.extension/class/signalFor..st
@@ -0,0 +1,3 @@
+*STON-Core
+signalFor: anObject 
+	^ (self new) object: anObject; signal: anObject.
diff --git a/repository/STON-Core.package/NotFound.extension/properties.json b/repository/STON-Core.package/NotFound.extension/properties.json
new file mode 100644
index 0000000..5c164dd
--- /dev/null
+++ b/repository/STON-Core.package/NotFound.extension/properties.json
@@ -0,0 +1,3 @@
+{
+  "name": "NotFound"
+}
\ No newline at end of file