diff --git a/3.-sharee.bike-API-description.md b/3.-sharee.bike-API-description.md
index a52be82..7f92a63 100644
--- a/3.-sharee.bike-API-description.md
+++ b/3.-sharee.bike-API-description.md
@@ -13,7 +13,18 @@ The data exchange format is based on HTTP's REST methods.
 
 **Rental bike bookings** are only possible after successful user authentication.
 
-The primary server (uri_primary) is used for user authentication. During the "booking_request" rental bike, the operator server responsible for the rental process (uri_operator) is delivered in the rental bike JSON object.
+The primary server (uri_primary) is used for:
+- request=authentication
+- request=authout
+- request=stations_available
+- request=bikes_available
+- request=user_bikes_occupied
+- request=user_minianswer
+
+During rental bike, the operator server responsible for the rental process (uri_operator) is delivered in the rental bike JSON object. It is usesd for:
+- request=booking_request
+- request=booking_update
+- request=user_feedback
 
 **encoding** UTF-8. All scalar JSON values ​​are delivered as data type "char" (text).