OpenAirUsage.md

@@ -27,6 +27,12 @@ We are in the midst of reworking the tutorials page:
 
 # 1. Recently Updated Tutorials #
 
+If you are a contributor on `develop` and using the latest tags (>= **`2019.w09`**), you better look into the embedded documents in this [folder](https://gitlab.eurecom.fr/oai/openairinterface5g/tree/develop/doc).
+
+*  The simplified build system is described [here](
+https://gitlab.eurecom.fr/oai/openairinterface5g/blob/develop/doc/BUILD.md)
+*  How to run now the softmodem is described [here](https://gitlab.eurecom.fr/oai/openairinterface5g/blob/develop/doc/RUNMODEM.md)
+
 The following tutorials have been reviewed and updated if needed.
 
 ##  eNB, EPC tutorials