typo in rvi_fragmentation.md

1 files changed, 10 insertions, 2 deletions

diff --git a/doc/rvi_fragmentation.md b/doc/rvi_fragmentation.md
index 077cb49..78362c9 100644
--- a/doc/rvi_fragmentation.md
+++ b/doc/rvi_fragmentation.md
@@ -44,10 +44,16 @@ Term      | Meaning
 ## System Overview
 
 The fragmentation support is intended to operate immediately on top of the transport
-layer. In
+layer. In essence, the sending side (Client) asks the fragmentation support to 
+deliver a message. The fragmentation support determines whether fragmentation is
+needed. If it is, it will create a first fragment, encode it and send it to the 
+receiving end (Server).
 
 <img src="images/frag-overview.png" alt="Overview" style="width:600">
 
+The fragmentation support can operate over a transport using its own fragment/reassembly
+method (such as TCP), but does not require it, or makes any such assumptions.
+
 ## Notation
 
 The fragmentation protocol does not specify any particular encoding method.
@@ -56,6 +62,8 @@ encoding, like msgpack [MSGP] would be more suitable.
 
 ## Messages
 
+<img src="images/rvi_protocol_frag1.png"
+
 The fragment messages are deliberately compact, in order to steal as little of
 the available transfer window from the fragment itself.
 
@@ -109,7 +117,7 @@ Code or range | Definition
 --------------| ----------------------
 `0`           | Message was successfully transfered and reassembled
 `-99 ... -1`  | Reserved for standard error codes
-`-1`          | Unknown message (i.e. in a `"frg-err"` response to a `"fgr-get"` message)
+`-1`          | Unknown message (i.e. in a `"frg-err"` response to a `"frg-get"` message)
 `-2`          | Protocol error
 `-3`          | Timeout error
 `< -99`       | Application-defined error codes