diff --git a/src/doc/tutorials/parameterfile.rst b/src/doc/tutorials/parameterfile.rst
index 2ce6309a59e518d6054ba20b04795ff57ceec55f..278d791644cf328d2051ff95ac6a7975aaf41aff 100644
--- a/src/doc/tutorials/parameterfile.rst
+++ b/src/doc/tutorials/parameterfile.rst
@@ -37,6 +37,16 @@ is the date of the Experiment. Thus, the data model could be described in a
        date:
          datatype: DATETIME
 
+
+We will identify Experiments solely using the date. Thus the
+``identifiable.yml`` is:
+
+.. code:: yaml
+
+  Experiment:
+     1. date
+
+
 The following section tells the crawler that the key value pair
 ``frequency: 0.5`` shall be used to set the Property "frequency" of an
 "Experiment" Record: