diff --git a/src/lte/doc/source/helpers.seqdiag b/src/lte/doc/source/helpers.seqdiag
index 244af2b6a..89eb5dd4b 100644
--- a/src/lte/doc/source/helpers.seqdiag
+++ b/src/lte/doc/source/helpers.seqdiag
@@ -4,18 +4,21 @@ diagram {
 
 LenaHelper => EpcHelper [label="AddEnb"] {
   EpcHelper  -> EpcHelper [label="create EpcEnbApplication"];
-  EpcHelper  => EpcSgwPgwApplication [label="SetupS1Link"];
-  EpcHelper  => EpcEnbApplication [label="SetupS1Link"];
+  EpcHelper  -> EpcHelper [label="Setup S1 link"];
 }
 
-LenaHelper => EpcHelper [label="SetupEpsBearer"] {
-  EpcHelper => EpcSgwPgwApplication [label="GTP/C CreateSessionRequest / BearerResourceCommand"] {
+LenaHelper => EpcHelper [label="ActivateEpsBearer"] {
+  EpcHelper => EpcSgwPgwApplication [label="CreateSessionRequestOrBearerResourceCommand", return="TEID"] {
     EpcSgwPgwApplication => EpcSgwPgwApplication [label="Setup S1 Bearer"];
-    EpcSgwPgwApplication => EpcEnbApplication [label="CreateBearer(TEID)"] {
-      EpcEnbApplication => EpcEnbApplication [label="SetupS1Bearer"];
-      EpcEnbApplication => LteEnbNetDevice [label="SetupRadioBearer", return="RBID"];
-    }
   }
+  EpcHelper => EpcEnbApplication [label="ErabSetupRequest(TEID)"] {
+    EpcEnbApplication => EpcEnbApplication [label="Setup S1 Bearer"];
+    EpcEnbApplication => LteEnbNetDevice [label="SetupRadioBearer", return="RBID"] {
+      LteEnbNetDevice -> LteEnbNetDevice [label="Setup Radio Bearer"]
+    }
+    EpcEnbApplication -> EpcEnbApplication [label="store TEID<->RBID mapping"]
+  }
+
   
 }
 
diff --git a/src/lte/doc/source/lte-design.rst b/src/lte/doc/source/lte-design.rst
index cbb818733..34f38f49c 100644
--- a/src/lte/doc/source/lte-design.rst
+++ b/src/lte/doc/source/lte-design.rst
@@ -399,6 +399,8 @@ For the uplink:
 Helpers
 +++++++
 
+Note: the role of the MME is taken by the EpcHelper, since we don't have an MME at the moment (the current code supports data plane only).
+
 .. seqdiag:: helpers.seqdiag