diff --git a/doc/manuals/chapters/overview.adoc b/doc/manuals/chapters/overview.adoc
index 566124a..2ff92fa 100644
--- a/doc/manuals/chapters/overview.adoc
+++ b/doc/manuals/chapters/overview.adoc
@@ -23,16 +23,16 @@
 [graphviz]
 ----
 digraph G {
-	rankdir=LR;
-	MS0 [label="MS"]
-	MS1 [label="MS"]
-	MS0->BTS [label="Um"]
-	MS1->BTS [label="Um"]
-	BTS->BSC [label="Abis"]
-	BSC->MSC [label="A"]
-	BTS->PCU [label="pcu_sock"]
-	PCU->SGSN [label="Gb"]
-	SGSN->GGSN [label="GTP"]
+        rankdir=LR;
+        MS0 [label="MS"];
+        MS1 [label="MS"];
+        MS0->BTS [label="Um"];
+        MS1->BTS [label="Um"];
+        BTS->BSC [label="Abis"];
+        BSC->MSC [label="A"];
+        BTS->PCU [label="pcu_sock"];
+        PCU->SGSN [label="Gb"];
+        SGSN->GGSN [label="GTP"];
 }
 ----
 
@@ -68,14 +68,6 @@
 point. It supports the GPRS ATTACH and GPRS ROUTING AREA UPDATE
 procedures, as well as GPRS ATTACH and GPRS DETACH.
 
-However, as the SGSN currently does not implement any type of HLR
-access, it is not able to authenticate a subscriber or even check if the
-subscriber exists at all.  As such, all non-roaming subscribes are
-allowed to attach to OsmoSGSN.  Non-roaming means that the first 5
-digits of the IMSI must match the MCC and MNC of the cell that the
-subscriber is registering to.
-
-
 ==== LLC Implementation
 
 The LLC (Logical Link Control) implementation of OsmoSGSN only supports