diff --git a/src/doc/tutorials/Data-Insertion.rst b/src/doc/tutorials/Data-Insertion.rst
index 2ead1cc259c807ee12f2459f7e452558eb1b63a2..5b1d1c0ca876f2ec37163df006bd4fdf75165976 100644
--- a/src/doc/tutorials/Data-Insertion.rst
+++ b/src/doc/tutorials/Data-Insertion.rst
@@ -10,7 +10,8 @@ at the chapter :any:`caosdb-server:Data Model` .
 
 In order to insert some actual data, we need to create a data model
 using RecordTypes and Properties (You may skip this if you use a CaosDB
-instance that already has the required types). So, let’s create a simple
+instance that already has the required types). When you create a new Property 
+you must supply a datatype. So, let’s create a simple
 Property called “a” of datatype double. This is very easy in pylib:
 
 .. code:: python