diff --git a/doc/source/library_packet.rst b/doc/source/library_packet.rst
index b4a5d919..a24b937f 100644
--- a/doc/source/library_packet.rst
+++ b/doc/source/library_packet.rst
@@ -85,12 +85,18 @@ serialize method. You have the raw data to send. The following example
 is building an arp packet.
 
 .. code-block:: python
-    
-    e = ethernet.ethernet(dst, src, ether.ETH_TYPE_8021Q)
+
+    from ryu.ofproto import ether
+    from ryu.lib.packet import ethernet, arp, packet
+
+    e = ethernet.ethernet(dst='ff:ff:ff:ff:ff:ff',
+                          src='08:60:6e:7f:74:e7',
+                          ethertype=ether.ETH_TYPE_ARP)
     a = arp.arp(hwtype=1, proto=0x0800, hlen=6, plen=4, opcode=2,
-                src='08:60:6e:7f:74:e7', src_ip='192.0.2.1',
-                dst='00:00:00:00:00:00', dst_ip='192.0.2.2')
+                src_mac='08:60:6e:7f:74:e7', src_ip='192.0.2.1',
+                dst_mac='00:00:00:00:00:00', dst_ip='192.0.2.2')
     p = packet.Packet()
     p.add_protocol(e)
     p.add_protocol(a)
     p.serialize()
+    print repr(p.data)  # the on-wire packet