diff --git a/CHANGELOG b/CHANGELOG
index 36216dc0..a9b1c139 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,40 @@
+N.B.: You *must* run
+
+     rake upgrade_instiki
+
+after installing the new software, to enjoy the benefits of this new version.
+
+------------------------------------------------------------------------------
+* 0.17.3
+
+The most important facet of this release is a small change in the database
+schema. Previously, people migrating from the default SQLite3 database to MySQL
+ran the risk of silent data loss, because MySQL had a more strict interpretation
+of the column types in the database. The new schema will prevent such problems.
+
+     rake upgrade_instiki
+
+will seamlessly upgrade your existing database to the new schema.
+
+New Features:
+* Passenger support (including X-Sendfile support, if the Apache mod_xsendfile
+  module is installed).
+* Update for itex2MML 1.3.13. (You should upgrade your itex2MML to the latest
+  version, too.)
+
+Bugs Fixed:
+* Refactored the Web model (from James Herdman).
+* Clean malformed utf-8 strings, rather than complaining about them.
+* Updated location of Textile help, since _why_the_lucky_stiff left the 'net.
+* Fixed a TeX rendering bug.
+* Updated list of XHTML+MathML named entities to match W3C Working Draft.
+* Refactored the Sanitizer (speedup).
+* Fix S5 Slideshows for non-root Instiki URLs.
+* Work around a Rails flash bug.
+* Links from published webs should work right (finally?).
+* An important database migration for MySQL users.
+
+------------------------------------------------------------------------------
 * 0.17.2
 
 Security: Updated to Rails 2.3.4
diff --git a/UPGRADING b/UPGRADING
new file mode 100644
index 00000000..d4ed0bc0
--- /dev/null
+++ b/UPGRADING
@@ -0,0 +1,13 @@
+UPGRADING
+=========
+
+See the upgrading instructions 
+
+     http://golem.ph.utexas.edu/wiki/instiki/show/Upgrading
+
+for detailed instructions. At a minimum, you need to backup your database.
+After installing the new software and restoring your database, you need to run
+
+     rake upgrade_instiki
+
+from the commandline, to complete the upgrade.
\ No newline at end of file
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 75d2a638..b87d2680 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -259,7 +259,7 @@ module Instiki
   module VERSION #:nodoc:
     MAJOR = 0
     MINOR = 17
-    TINY  = 2 
+    TINY  = 3 
     SUFFIX = '(MML+)'
     PRERELEASE =  false
     if PRERELEASE