diff --git a/source/guides/study-management.rst b/source/guides/study-management.rst
index baca3f5376f3cfea04ebdfdeb484fa271b289af7..a12cc316dcb9130387de9ef3c6b0cb9ff1346f13 100644
--- a/source/guides/study-management.rst
+++ b/source/guides/study-management.rst
@@ -14,9 +14,19 @@ Create a study
     -   **Phone number** and **E-mail-address** are the contact information at
         which the contact person can be reached
 
-3.  Fill in any additional information (you can still do that later)
+3.  Decide on setting it up as a regular study that includes study recruitment 
+    and execution or as a **one time invitation**. The option **Is a one time 
+    invitation** should only be used when you are sure that it is sufficient to 
+    invite potential subjects **anonymously** via mail.
 
-4.  Click on **Save** to record your progress
+4.  Fill in any additional information (you can still do that later)
+
+5.  Click on **Save** to record your progress
+
+.. warning::
+    When choosing option **Is a one time invitation**: Please be aware that 
+    Castellum will **not** track actual participations or appointments and it 
+    will **not** provide pseudonyms within the study.  
 
 Now you can :ref:`find your study <study-search>` in the studies list.