diff --git a/docs/clmc-service.md b/docs/clmc-service.md
index bbb48286a1aaa56e81cbbc4089b302cd290e098b..ab1179f4664ce39634802f446ab8e379bc6b3cca 100644
--- a/docs/clmc-service.md
+++ b/docs/clmc-service.md
@@ -37,6 +37,13 @@ It offers different API endpoints to configure and control the aggregator as wel
 
 #### Graph API Endpoints
 
+* **Assumptions**
+    * For each service function, there is a field/fields from which the service function response time (service delay) can be derived.
+    * For each service function, there is a field/fields from which an average estimation of the size of a **request** to this service function can be derived.
+    * For each service function, there is a field/fields from which an average estimation of the size of a **response** from this service function can be derived.
+    * All the aforementioned fields reside in a single measurement.
+    * There is at most 1 service function hosted on a particular endpoint.
+
 * **POST** ***/graph/temporal?from={timestamp-seconds}&to={timestamp-seconds}***
 
     This API method sends a request to the CLMC service to build a graph related to the time range declared with the *from* and *to* URL parameters.