diff --git a/changes.txt b/changes.txt
index db678bf..5305b5f 100644
--- a/changes.txt
+++ b/changes.txt
@@ -1,3 +1,59 @@
+Version 0.4.0:
+	Bugfix: Fixed a crash in closesocket.
+	
+	Bugfix: Properly handle interface indexes when some are disabled.
+	
+	Bugfix: Fixed a deadlock caused by getsockopt.
+	
+	Update: Implemented new address cache which stores the full sockaddr structure
+	for each remote socket.
+	
+	Cleanup: Integer types for storing 32 and 48-bit addresses and functions for
+	manipulating them.
+	
+	Cleanup: Rewrote registry access code.
+	
+	Cleanup: Implemented library functions for loading and saving configuration.
+	
+	Cleanup: Configuration data written to registry in more sensible format.
+	
+	Bugfix: Always use correct DLL names when logging calls in stub DLLs.
+	
+	Bugfix: Properly handle interfaces without an IP address set.
+	
+	Feature: Support interfaces with multiple assigned IP addresses.
+	
+	Update: Periodically reload the interfaces and cache the result so the list can
+	be used in more contexts without a performance hit.
+	
+	Cleanup: Check if packets were sent from us by using the source IPX address and
+	local interface list rather than maintaining a list of local IP addresses.
+	
+	Feature: Wildcard interface at index 0 to send/recv packets on all interfaces.
+	
+	Update: Removed options to disable source IP address filtering and selective
+	broadcasting.
+	
+	Update: Removed ipxrouter program, no longer needed.
+	
+	Cleanup: Removed out-of-process router support, multiple instances now keep a
+	list of bound addresses in shared memory.
+	
+	Cleanup: Update the address cache in the router main loop rather than including
+	the source IP in a header prefixed to the relayed packet.
+	
+	Update: Each instance of IPXWrapper binds to a random UDP port for sending and
+	receiving packets. The "normal" port is shared for receiving broadcasts only.
+	
+	Bugfix: Check source socket number before relaying to a connected socket.
+	
+	Update: Store IPX sockets in a hash table rather than a linked list.
+	
+	Cleanup: Removed RETURN and RETURN_WSA macros used by the WinSock code.
+	
+	Cleanup: Use some IPXWrapper library code for interface and registry handling
+	in ipxconfig.
+
 Version 0.3.4:
 	Feature: Added workaround for games that unset SystemRoot in the environment
 	such as Carmageddon II.
diff --git a/readme.txt b/readme.txt
index a30ee78..939865e 100644
--- a/readme.txt
+++ b/readme.txt
@@ -7,20 +7,19 @@ Read license.txt for licensing terms.
 
 -- INTRODUCTION --
 
-IPXwrapper is a WinSock wrapper which transparently tunnels IPX packets over a
-chosen UDP port (54792 by default). To use it, simply copy the four included
-DLL files to the directory containing your legacy program.
+IPXWrapper is a wrapper library which transparently tunnels IPX packets over IP
+using UDP. To use it, simply copy the four included DLL files to the directory
+containing your legacy program.
 
 If you are running Windows Vista or later and the game uses DirectPlay you may
 also need to import directplay-win32.reg or directplay-win64.reg as appropriate.
 
-Using more than one program at a time with IPXWrapper requires running ipxrouter
-first, this will bind to the UDP port and pass any recieved packets to the
-correct process.
-
-Most software binds only to the default interface, if you get no errors but still
-can't connect to other computers, try running the ipxconfig program and selecting
-the appropriate default interface.
+The "wildcard" interface is used by default, this will send and receieve packets
+on all available network interfaces and may cause problems if you share more
+than one network with the other computers running IPXWrapper. To use a single
+interface, run the ipxconfig program and select a different primary interface,
+change which interfaces are enabled or pick a different interface in the options
+of your program.
 
 Software using IPXWrapper can't communicate with software that is using the real
 IPX protocol and vice-versa.