diff --git a/doc/migration-format.md b/doc/migration-format.md
index e1cdd98..f6f3dd0 100644
--- a/doc/migration-format.md
+++ b/doc/migration-format.md
@@ -1,19 +1,51 @@
-# IndieHosters migration format, version 0.2.2
+# IndieHosters migration format
+
+# Version 0.3
+
+### General
+
+An IndieHosters migration archive is a directory structure (probably packaged up as a tar file or zip file).
+There should be an 'indiehosters.json' file in the root of the archive. It should contain at least the following fields:
+
+ * format: the URL of this spec (probably https://indiehosters.net/spec/0.3)
+ * application: a string, which determines what the rest of the folder contents should be imported into.
+
+
+## Known
+
+When migrating a Known application, the 'indiehosters.json' file should furthermore contain the following fields:
+
+  * application: 'known'
+  * version: the version of Known as a string, for instance '0.6.5'
+  * database:
+    * engine: the database engine used, either 'mysql' or 'mongodb'
+    * name: the database name inside the dump file, for instance 'known'
+    * file: the database dump file inside the archive, for instance 'dump.sql'
+  * uploads: the uploads folder name inside the archive, for instance 'uploads/'
+  * plugins: the folder with any non-standard plugins for instance 'plugins/'
+
+
+## WordPress
+
+(to be determined)
+
+
+## Version 0.2.2 (deprecated)
 
 When a user exports their data for domain.com, they get a zip or tar file that contains different files, depending on which application is
 running on their domain:
 
-## If using the 'static' application
+### If using the 'static' application
 
 * TLS/domain.com.pem - Concatenation of the unencrypted private and public key of the TLS certificate, and intermediate CA cert if applicable.
 * static/www-content - static content to be placed in the web root
 
-## If using the 'static-git' application
+### If using the 'static-git' application
 
 * TLS/domain.com.pem - Concatenation of the unencrypted private and public key of the TLS certificate, and intermediate CA cert if applicable.
 * static-git/GITURL - git url to pull the static website content from
 
-## If using the 'WordPress' application
+### If using the 'WordPress' application
 
 * TLS/domain.com.pem - Concatenation of the unencrypted private and public key of the TLS certificate, and intermediate CA cert if applicable.
 * mysql/dump.sql - the dump of all their MySQL databases
@@ -23,7 +55,7 @@ running on their domain:
 * wordpress/.htaccess - htaccess file for WordPress
 * wordpress/wp-content - php files to be placed in the web root
 
-## If using the 'Known' application
+### If using the 'Known' application
 
 * TLS/domain.com.pem - Concatenation of the unencrypted private and public key of the TLS certificate, and intermediate CA cert if applicable.
 * mysql/dump.sql - the dump of all their MySQL databases