Index: docs/databases.txt
===================================================================
--- docs/databases.txt	(revision 6430)
+++ docs/databases.txt	(working copy)
@@ -76,6 +76,12 @@
 If you are trying to use an older version of MySQL and the ``mysql_old``
 backend, then 1.2.0 *might* work for you.
 
+If you see ``ImportError: cannot import name ImmutableSet``, your MySQLdb
+installation may contain an outdated ``sets.py`` file that conflicts with
+the built-in module of the same name from Python 2.4 or later.  To fix this,
+verify that you have MySQLdb version 1.2.1p2 or newer, then delete any
+``sets.py`` file in the MySQLdb directory that was left by an earlier version.
+
 .. _MySQLdb: http://sourceforge.net/projects/mysql-python
 
 Creating your database
@@ -162,4 +168,3 @@
       AlterModelOnSyncDB_.
 
 .. _AlterModelOnSyncDB: http://code.djangoproject.com/wiki/AlterModelOnSyncDB
-