[ci skip] Add a note to CI_Model::__get() (issue #3046)
diff --git a/system/core/Model.php b/system/core/Model.php
index 9485ec2..9736faa 100644
--- a/system/core/Model.php
+++ b/system/core/Model.php
@@ -59,6 +59,10 @@
 	 */
 	public function __get($key)
 	{
+		// Debugging note:
+		//	If you're here because you're getting an error message
+		//	saying 'Undefined Property: system/core/Model.php', it's
+		//	most likely a typo in your model code.
 		return get_instance()->$key;
 	}