doc: tweak protocols ascii art
diff --git a/doc/protocols_around_hnbgw.txt b/doc/protocols_around_hnbgw.txt
index a72bc54..5af2623 100644
--- a/doc/protocols_around_hnbgw.txt
+++ b/doc/protocols_around_hnbgw.txt
@@ -1,17 +1,15 @@
-Who Talks What Around the Home Node B Gateway
-=============================================
-(wip 2016-01-11)
-
+Protocols Around the Home Node B Gateway
+========================================
+------------+ +--------+ +----------+
UE <-->| hNodeB |<--Iuh---->| HNB-GW |<--IuCS-->| OsmoCSCN |
- UE <-->| femto cell | ...-->| | +----------+
- | | | |
+ UE <-->| femto cell | ...-->| | ...-->| |
+ | | | | +----------+
+------------+<--GTP-U | |
\ | | +------+ +------+
| | |<--IuPS-->| SGSN |<--GTP-C-->| GGSN |
- | +--------+ +------+ GTP-U-->| |
- | / +------+
+ | +--------+ ...-->| | GTP-U-->| |
+ | +------+ / +------+
\_______________________________/