diff --git a/README.rst b/README.rst
index f276660..62242fb 100644
--- a/README.rst
+++ b/README.rst
@@ -40,10 +40,13 @@ Few examples are available.
 You can get more examples at
 `blockdiag.com`_ .
 
-simple.diag
-------------
+nwdiag Example
+==============
+following instructions shows how to generate png and svg for nwdiag
 
-simple.diag is simply define nodes and transitions by dot-like text format::
+create file, ex: `nw.diag`
+
+nw.diag is simply define nodes and transitions by dot-like text format::
 
     nwdiag {
       network dmz {
@@ -64,14 +67,95 @@ simple.diag is simply define nodes and transitions by dot-like text format::
 
 
 Usage
-=====
+-----
 
 Execute nwdiag command::
 
-   $ nwdiag simple.diag
-   $ ls simple.png
-   simple.png
+   $ nwdiag nw.diag
+   $ ls nw.png
+   nw.png
+
+   $ nwdiag nw.diag -T svg
+   $ ls nw.svg
+   nw.svg
+
+packetdiag Example
+==================
+following instructions shows how to generate png and svg for packetdiag
+
+create file, ex: `packet.diag`
+
+::
+
+    packetdiag {
+      colwidth = 32;
+      node_height = 72;
+
+      0-15: Source Port;
+      16-31: Destination Port;
+      32-63: Sequence Number;
+      64-95: Acknowledgment Number;
+      96-99: Data Offset;
+      100-105: Reserved;
+      106: URG [rotate = 270];
+      107: ACK [rotate = 270];
+      108: PSH [rotate = 270];
+      109: RST [rotate = 270];
+      110: SYN [rotate = 270];
+      111: FIN [rotate = 270];
+      112-127: Window;
+      128-143: Checksum;
+      144-159: Urgent Pointer;
+      160-191: (Options and Padding);
+      192-223: data [colheight = 3];
+    }
+
+
+Usage
+-----
+
+Execute packetdiag command::
+
+   $ packetdiag packet.diag
+   $ ls packet.png
+   packet.png
+
+   $ packetdiag packet.diag -T svg
+   $ ls packet.svg
+   packet.svg
+
+rackdiag Example
+================
+following instructions shows how to generate png and svg for rackdiag
+
+create file, ex: `rack.diag`
+
+::
+
+   rackdiag {
+      16U;
+      1: UPS [2U];
+      3: DB Server;
+      4: Web Server;
+      5: Web Server;
+      6: Web Server;
+      7: Load Balancer;
+      8: L3 Switch;
+   }
+
+
+Usage
+-----
+
+Execute rackdiag command::
+
+   $ rackdiag rack.diag
+   $ ls rack.png
+   rack.png
 
+   $ rackdiag rack.diag -T svg
+   $ ls rack.svg
+   rack.svg
 
 Requirements
 ============